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Two views of the Earth from space.

Achieving sustainability will enable the Earth to continue supporting human life as we know it. "Blue Marble" NASA composite images: 2001 (left), 2002 (right).

Sustainability is the capacity to endure. In ecology the word describes how biological systems remain diverse and productive over time. For humans it is the potential for long-term maintenance of well being, which in turn depends on the well being of the natural world and the responsible use of natural resources.

Sustainability has become a wide-ranging term that can be applied to almost every facet of life on Earth, from local to a global scale and over various time periods. Long-lived and healthy wetlands and forests are examples of sustainable biological systems. Invisible chemical cycles redistribute water, oxygen, nitrogen and carbon through the world's living and non-living systems, and have sustained life for millions of years. As the earth’s human population has increased, natural ecosystems have declined and changes in the balance of natural cycles has had a negative impact on both humans and other living systems.[1]

There is abundant scientific evidence that humanity is living unsustainably, and returning human use of natural resources to within sustainable limits will require a major collective effort.[1] Ways of living more sustainably can take many forms from reorganising living conditions (e.g., ecovillages, eco-municipalities and sustainable cities), reappraising economic sectors (permaculture, green building, sustainable agriculture), or work practices (sustainable architecture), using science to develop new technologies (green technologies, renewable energy), to adjustments in individual lifestyles that conserve natural resources.

DefinitionEdit

Three intersecting circles representing economy, society and environment showing how sustainability involves cooperation at the point where they all intersect.

Definitions of sustainability often refer to the "three pillars" of social, environmental and economic sustainability (2006)[2]

Three circles enclosed within one-another showing how both economy and society are constrained by environmental limits

A representation of sustainability showing how both economy and society are constrained by environmental limits (2003)[3]

The word sustainability is derived from the Latin sustinere (tenere, to hold; sus, up). Dictionaries provide more than ten meanings for sustain, the main ones being to “maintain", "support", or "endure”.[4][5] However, since the 1980s sustainability has been used more in the sense of human sustainability on planet Earth and this has resulted in the most widely quoted definition of sustainability and sustainable development, that of the Brundtland Commission of the United Nations on March 20, 1987: “sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”[6][7]

At the 2005 World Summit it was noted that this requires the reconciliation of environmental, social and economic demands - the "three pillars" of sustainability.[8] This view has been expressed as an illustration using three overlapping ellipses indicating that the three pillars of sustainability are not mutually exclusive and can be mutually reinforcing.[9]

The UN definition is not universally accepted and has undergone various interpretations.[10][11][12] What sustainability is, what its goals should be, and how these goals are to be achieved is all open to interpretation.[13] For many environmentalists the idea of sustainable development is an oxymoron as development seems to entail environmental degradation.[14] Ecological economist Herman Daly has asked, "what use is a sawmill without a forest?"[15] From this perspective, the economy is a subsystem of human society, which is itself a subsystem of the biosphere, and a gain in one sector is a loss from another.[16] This can be illustrated as three concentric circles.

A universally accepted definition of sustainability is elusive because it is expected to achieve many things. On the one hand it needs to be factual and scientific, a clear statement of a specific “destination”. The simple definition "sustainability is improving the quality of human life while living within the carrying capacity of supporting eco-systems",[17] though vague, conveys the idea of sustainability having quantifiable limits. But sustainability is also a call to action, a task in progress or “journey”[18] and therefore a political process, so some definitions set out common goals and values.</font> The Earth Charter[19] speaks of “a sustainable global society founded on respect for nature, universal human rights, economic justice, and a culture of peace.”

To add complication the word sustainability is applied not only to human sustainability on Earth, but to many situations and contexts over many scales of space and time, from small local ones to the global balance of production and consumption. It can also refer to a future intention: "sustainable agriculture" is not necessarily a current situation but a goal for the future, a prediction.[20] For all these reasons sustainability is perceived, at one extreme, as nothing more than a feel-good buzzword with little meaning or substance[21][22] but, at the other, as an important but unfocused concept like "liberty" or "justice".[23] It has also been described as a "dialogue of values that defies consensual definition".[24]

HistoryEdit

Main article: History of sustainability

In early human history the environmental impacts of small bands of hunter-gatherers would have been relatively small, even though the use of fire and the desire for specific foods may have altered the natural composition of plant and animal communities.[25] The Neolithic Revolution 2,500 to 10,000 years ago marked the emergence of agriculture and settled communities. Societies outgrowing their local food supply or depleting critical resources either moved on or faced collapse. In contrast, stable communities of shifting cultivators and horticulturists existed in New Guinea and South America, and large agrarian communities in China, India, Polynesia and elsewhere have farmed in the same localities for centuries.[26][27]

ClaySumerianSickle

A Sumerian Harvester's sickle dated to about 3000 BC

Technological advances over several millennia gave humans increasing control over the environment. But it was the Western industrial revolution of the 17th to 19th centuries that tapped into the vast growth potential of the energy in fossil fuels to power sophisticated machinery technology.[28] These conditions led to a human population explosion and unprecedented industrial, technological and scientific growth that has continued to this day. From 1650 to 1850 the global population doubled from around 500 million to 1 billion people.[29] By the 20th century, the industrial revolution had resulted in an exponential increase in the human consumption of resources and an increase in health, wealth and population. Ecology as a new scientific discipline was gaining general acceptance and ideas now part and parcel to sustainability were being explored including the recognition of the interconnectedness of living systems, the importance of global natural cycles, the passage of energy through trophic levels of living systems.[30]

File:Silent Spring Book-of-the-Month-Club edition.JPG

After the deprivations of the Great Depression and World War II the developed world entered a post-1950s "great acceleration” of growth and population (the "Golden age of capitalism") while a gathering environmental movement pointed out that there were environmental costs associated with the many material benefits that were now being enjoyed. Technological innovations included plastics, synthetic chemicals and nuclear energy as fossil fuels also continued to transform society. The negative influences of the new technology were documented by American marine biologist and naturalist Rachel Carson in her influential book Silent Spring in 1962. A period of peak oil production was anticipated in 1956 by American geoscientist M. King Hubbert's peak oil theory.[31] In the 1970s environmentalism's concern with pollution, the population explosion, consumerism and the depletion of finite resources found expression in Is growth obsolete?, by American economists William Nordhaus and James Tobin,[32] Small Is Beautiful, by British economist Ernst Friedrich Schumacher in 1973, and The Limits to Growth published by the global think tank, the Club of Rome, in 1975. By the late twentieth century environmental problems were becoming global in scale.[33][34][35][36] and the 1973 and 1979 energy crises demonstrated the extent to which the global community had become dependent on a nonrenewable resource.

In 1987 the United Nation's World Commission on Environment and Development (the Brundtland Commission), in its report Our Common Future suggested that sustainable development was needed to meet human needs while not increasing environmental problems. In 1961 almost all countries in the world had the capacity to meet their own demand but by 2005 the situation had changed and many countries were able to meet their needs only by importing resources from other nations.[34] A move toward more sustainable living emerged, based on increasing public awareness and adoption of recycling, and renewable energies. The development of renewable sources of energy in the 1970s and 80's, primarily in wind turbines and photovoltaics and increased use of hydroelectricity, presented more sustainable alternatives to fossil fuel and nuclear energy generation.[37][38]

In the 21st century there is heightened awareness of the threat posed by the human-induced greenhouse effect.[39][40] Ecological economics now seeks to bridge the gap between ecology and traditional neoclassical economics:[41][42] and proposes an inclusive and ethical economic model for society. Many new techniques have arisen to help measure and implement sustainability, including Life Cycle Assessment, Cradle to Cradle, Ecological Footprint Analysis, and green building.[43] The work of Bina Agarwal and Vandana Shiva amongst many others, has brought some of the cultural knowledge of traditional, sustainable agrarian societies into the academic discourse on sustainability, and blended that knowledge with modern scientific principles.[44]

Principles and conceptsEdit

The philosophical and analytic framework of sustainability draws on and connects with many different disciplines and fields; in recent years an area that has come to be called sustainability science has emerged. Sustainability science is not yet an autonomous field or discipline of its own, and has tended to be problem-driven and oriented towards guiding decision-making.[45]

Scale and contextEdit

Sustainability is studied and managed over many scales (levels or frames of reference) of time and space and in many contexts of environmental, social and economic organization. The focus ranges from the total carrying capacity (sustainability) of planet Earth to the sustainability of economic sectors, ecosystems, countries, municipalities, neighbourhoods, home gardens, individual lives, individual goods and services, occupations, lifestyles, behaviour patterns and so on. In short, it can entail the full compass of biological and human activity or any part of it.[46] As Daniel Botkin, author and environmentalist, has stated: "We see a landscape that is always in flux, changing over many scales of time and space."[47]

Consumption — population, technology, resourcesEdit

The overall driver of human impact on Earth systems is the destruction of biophysical resources, and especially, the Earth's ecosystems. The total environmental impact of a community or of humankind as a whole depends both on population and impact per person, which in turn depends in complex ways on what resources are being used, whether or not those resources are renewable, and the scale of the human activity relative to the carrying capacity of the ecosystems involved.

Historically, humanity has responded to a demand for more resources by trying to increase supply.[citation needed] As supplies inevitably become depleted sustainable practices are encouraged[by whom?] through demand management for all goods and services — by promoting reduced consumption, using renewable resources where possible, and encouraging practices that minimise resource intensity while maximising resource productivity.[citation needed] Careful resource management can be applied at many scales, from economic sectors like agriculture, manufacturing and industry, to work organisations, the consumption patterns of households and individuals and to the resource demands of individual goods and services.[48][49]

One of the initial attempts to express human impact mathematically was developed in the 70's and is called the I PAT formula. This formulation attempts to explain human consumption in terms of three components: population numbers, levels of consumption (which it terms "affluence", although the usage is different), and impact per unit of resource use (which is termed "technology", because this impact depends on the technology used). The equation is expressed:

I = P × A × T
Where: I = Environmental impact, P = Population, A = Affluence, T = Technology[50]

MeasurementEdit

Main article: Sustainability measurement

By establishing quantitative measures for sustainability it becomes possible to set goals, apply management strategies, and measure progress. The Natural Step (TNS) framework developed by Karl-Henrik Robèrt examines sustainability and resource use from its thermodynamic foundations to determine</font> how humans use and apportion natural capital in a way that is sustainable and just. The TNS framework's system conditions of sustainability provide a means for the scientifically based measurement of sustainability.[51] Natural capital includes resources from the earth's crust (i.e., minerals, oil), those produced by humans (synthetic substances), and those of the biosphere. Equitable access to natural capital is also a component of sustainability.[51] The energy generated in use of resources—referred to as exergy[52]—can be measured as the embodied energy of a product or service over its life cycle. Its analysis, using methods such as Life Cycle Analysis or Ecological Footprint analysis provide basic indicators of sustainability on various scales.[53]

There are now a vast number of sustainability indicators,[54] metrics, benchmarks, indices, reporting procedures, audits and more. They include environmental, social and economic measures separately or together over many scales and contexts. Environmental factors are integrated with economics through ecological economics, resource economics and thermoeconomics, and social factors through metrics like the Happy Planet Index which measures the well-being of people in the nations of the world while taking into account their environmental impact.[2][55] Some of the best known and most widely used sustainability measures include corporate sustainability reporting, Triple Bottom Line accounting, and estimates of the quality of sustainability governance for individual countries using the Environmental Sustainability Index and Environmental Performance Index.

At the global level, and from the equation I = PAT, it is clear that measuring sustainability requires a knowledge of the world's expected population. We also need estimates of how many people the Earth can support. This is a tall order but for many years now scientists have been refining models of the carrying capacity of planet Earth by measuring key human impacts, especially those that relate to biodiversity.

PopulationEdit

Main article: Population control
Graph showing human population growth from 10,000 BC – 2000 AD, illustrating current exponential growth

Graph showing human population growth from 10,000 BCAD 2000, illustrating current exponential growth

According to the 2008 Revision of the official United Nations population estimates and projections, the world population is projected to reach 7 billion early in 2012, up from the current 6.9 billion (May 2009), to exceed 9 billion people by 2050. Most of the increase will be in developing countries whose population is projected to rise from 5.6 billion in 2009 to 7.9 billion in 2050. This increase will be distributed among the population aged 15–59 (1.2 billion) and 60 or over (1.1 billion) because the number of children under age 15 in developing countries will decrease. In contrast, the population of the more developed regions is expected to undergo only slight increase from 1.23 billion to 1.28 billion, and this would have declined to 1.15 billion but for a projected net migration from developing to developed countries, which is expected to average 2.4 million persons annually from 2009 to 2050.[56] Long-term estimates of global population suggest a peak at around 2070 of nine to ten billion people, and then a slow decrease to 8.4 billion by 2100.[57]

Emerging economies like those of China and India aspire to the living standards of the Western world as does the non-industrialized world in general.[58] It is the combination of population increase in the developing world and unsustainable consumption levels in the developed world that poses a stark challenge to sustainability.[59]

Carrying capacityEdit

Graph comparing the Ecological Footprint of different nations with their Human Development Index

Ecological footprint for different nations compared to their Human Development Index (HDI)

More and more data are indicating that humans are not living within the carrying capacity of the planet. The Ecological footprint measures human consumption in terms of the biologically productive land needed to provide the resources, and absorb the wastes of the average global citizen. In 2008 it required 2.7 global hectares per person, 30% more than the natural biological capacity of 2.1 global hectares (assuming no provision for other organisms).[34] The resulting ecological deficit must be met from unsustainable extra sources and these are obtained in three ways: embedded in the goods and services of world trade; taken from the past (e.g. fossil fuels); or borrowed from the future as unsustainable resource usage (e.g. by over exploiting forests and fisheries).

The figure (right) compares the sustainability of countries by contrasting their Ecological Footprint with their UN Human Development Index (a measure of standard of living). The graph shows what is necessary for countries to maintain an acceptable standard of living for their citizens while, at the same time, maintaining sustainable resource use. The general trend is for higher standards of living to become less sustainable. As always population growth has a marked influence on levels of consumption and the efficiency of resource use.[50][60] The sustainability goal is to raise the global standard of living without increasing the use of resources beyond globally sustainable levels; that is, to not exceed "one planet" consumption. Information generated by reports at the national, regional and city scales confirm the global trend towards societies that are becoming less sustainable over time.[61][62]

Global human impact on biodiversityEdit

At a fundamental level energy flow and biogeochemical cycling set an upper limit on the number and mass of organisms in any ecosystem.[63] Human impacts on the Earth are demonstrated in a general way through detrimental changes in the global biogeochemical cycles of chemicals that are critical to life, most notably those of water, oxygen, carbon, nitrogen and phosphorus.[64] Template:Gallery

The Millennium Ecosystem Assessment is an international synthesis by over 1000 of the world's leading biological scientists that analyses the state of the Earth’s ecosystems and provides summaries and guidelines for decision-makers. It concludes that human activity is having a significant and escalating impact on the biodiversity of world ecosystems, reducing both their resilience and biocapacity. The report refers to natural systems as humanity's "life-support system", providing essential "ecosystem services". The assessment measures 24 ecosystem services concluding that only four have shown improvement over the last 50 years, 15 are in serious decline, and five are in a precarious condition.[65]

Environmental dimensionEdit

Healthy ecosystems provide vital goods and services to humans and other organisms. There are two major ways of reducing negative human impact and enhancing ecosystem services:

a) Environmental management. This direct approach is based largely on information gained from earth science, environmental science and conservation biology.

However, this is management at the end of a long series of indirect causal factors that are initiated by human consumption, so a second approach is through demand management of human resource use.

b) Management of human consumption of resources, an indirect approach based largely on information gained from economics. Herman Daly has suggested three broad criteria for ecological sustainability: renewable resources should provide a sustainable yield (the rate of harvest should not exceed the rate of regeneration); for non-renewable resources there should be equivalent development of renewable substitutes; waste generation should not exceed the assimilative capacity of the environment.[66]

Environmental managementEdit

At the global scale and in the broadest sense environmental management involves the oceans, freshwater systems, land and atmosphere, but following the sustainability principle of scale it can be equally applied to any ecosystem from a tropical rainforest to a home garden.[67][68]

AtmosphereEdit

In March 2009 at a meeting of the Copenhagen Climate Council 2,500 climate experts from 80 countries issued a keynote statement that there is now "no excuse" for failing to act on global warming and that without strong carbon reduction targets "abrupt or irreversible" shifts in climate may occur that "will be very difficult for contemporary societies to cope with".[69][70] Management of the global atmosphere now involves assessment of all aspects of the carbon cycle to identify opportunities to address human-induced climate change and this has become a major focus of scientific research because of the potential catastrophic effects on biodiversity and human communities (see Energy below).

Other human impacts on the atmosphere include the air pollution in cities, the pollutants including toxic chemicals like nitrogen oxides, sulphur oxides, volatile organic compounds and particulate matter that produce photochemical smog and acid rain, and the chlorofluorocarbons that degrade the ozone layer. Anthropogenic particulates such as sulphate aerosols in the atmosphere reduce the direct irradiance and reflectance (albedo) of the Earth's surface. Known as global dimming the decrease is estimated to have been about 4% between 1960 and 1990 although the trend has subsequently reversed. Global dimming may have disturbed the global water cycle by reducing evaporation and rainfall in some areas. It also creates a cooling effect and this may have partially masked the effect of greenhouse gases on global warming.[71]

OceansEdit

Display of about ten well-known saltwater fish

A selection of the world's saltwater fish

Ocean circulation patterns have a strong influence on climate and weather and, in turn, the food supply of both humans and other organisms. Scientists have warned of the possibility, under the influence of climate change, of a sudden alteration in circulation patterns of ocean currents that could drastically alter the climate in some regions of the globe.[72] Major human environmental impacts occur in the more habitable regions of the ocean fringes – the estuaries, coastline and bays. Ten per cent of the world's population – about 600 million people – live in low-lying areas vulnerable to sea level rise. Trends of concern that require management include: over-fishing (beyond sustainable levels);[73] coral bleaching due to ocean warming and ocean acidification due to increasing levels of dissolved carbon dioxide;[74] and sea level rise due to climate change. Because of their vastness oceans also act as a convenient dumping ground for human waste.[75] Remedial strategies include: more careful waste management, statutory control of overfishing by adoption of sustainable fishing practices and the use of environmentally sensitive and sustainable aquaculture and fish farming, reduction of fossil fuel emissions and restoration of coastal and other marine habitat.[76]

FreshwaterEdit

Water covers 71% of the Earth's surface. Of this, 97.5% is the salty water of the oceans and only 2.5% freshwater, most of which is locked up in the Antarctic ice sheet. The remaining freshwater is found in lakes, rivers, wetlands, the soil, aquifers and atmosphere. All life depends on the solar-powered global water cycle, the evaporation from oceans and land to form water vapour that later condenses from clouds as rain, which then becomes the renewable part of the freshwater supply.[77] Awareness of the global importance of preserving water for ecosystem services has only recently emerged as, during the 20th century, more than half the world’s wetlands have been lost along with their valuable environmental services. Biodiversity-rich freshwater ecosystems are currently declining faster than marine or land ecosystems[78] making them the world's most vulnerable habitats.[34] Increasing urbanization pollutes clean water supplies and much of the world still does not have access to clean, safe water.[77] In the industrial world demand management has slowed absolute usage rates but increasingly water is being transported over vast distances from water-rich natural areas to population-dense urban areas and energy-hungry desalination is becoming more widely used. Greater emphasis is now being placed on the improved management of blue (harvestable) and green (soil water available for plant use) water, and this applies at all scales of water management.[78]

LandEdit

Loss of biodiversity stems largely from the habitat loss and fragmentation produced by the human appropriation of land for development, forestry and agriculture as natural capital is progressively converted to man-made capital. Land use change is fundamental to the operations of the biosphere because alterations in the relative proportions of land dedicated to urbanisation, agriculture, forest, woodland, grassland and pasture have a marked effect on the global water, carbon and nitrogen biogeochemical cycles and this can impact negatively on both natural and human systems.[79] At the local human scale major sustainability benefits accrue from the pursuit of green cities and sustainable parks and gardens.[80][81]

ForestsEdit

Since the Neolithic Revolution about 47% of the world’s forests have been lost to human use. Present-day forests occupy about a quarter of the world’s ice-free land with about half of these occurring in the tropics[82] In temperate and boreal regions forest area is gradually increasing (with the exception of Siberia), but deforestation in the tropics is of major concern.[83]

Beech Forest – Grib Skov, Denmark

Beech Forest – Grib Skov, Denmark

Forests moderate the local climate and the global water cycle through their light reflectance (albedo) and evapotranspiration. They also conserve biodiversity, protect water quality, preserve soil and soil quality, provide fuel and pharmaceuticals, and purify the air. These free ecosystem services are not given a market value under most current economic systems, and so forest conservation has little appeal when compared with the economic benefits of logging and clearance which, through soil degradation and organic decomposition returns carbon dioxide to the atmosphere.[84] The United Nations Food and Agriculture Organization (FAO) estimates that about 90% of the carbon stored in land vegetation is locked up in trees and that they sequester about 50% more carbon than is present in the atmosphere. Changes in land use currently contribute about 20% of total global carbon emissions (heavily logged Indonesia and Brazil are a major source of emissions).[84] Climate change can be mitigated by sequestering carbon in reafforestation schemes, plantations and timber products. Also wood biomass can be utilized as a renewable carbon-neutral fuel. The FAO has suggested that, over the period 2005–2050, effective use of tree planting could absorb about 10–20% of man-made emissions – so monitoring the condition of the world's forests must be part of a global strategy to mitigate emissions and protect ecosystem services.[85] However, climate change may pre-empt this FAO scenario as a study by the International Union of Forest Research Organizations in 2009 concluded that the stress of a 2.5C (4.5F) temperature rise above pre-industrial levels could result in the release of vast amounts of carbon[86] so the potential of forests to act as carbon "sinks" is "at risk of being lost entirely".[87]

Cultivated landEdit

Main article: Sustainable agriculture
A farmer working in a rice paddy

A rice paddy. Rice, wheat, corn and potatoes make up more than half the world's food supply

Feeding more than six billion human bodies takes a heavy toll on the Earth’s resources. This begins with the appropriation of about 38% of the Earth’s land surface[88] and about 20% of its net primary productivity.[89] Added to this are the resource-hungry activities of industrial agribusiness – everything from the crop need for irrigation water, synthetic fertilizers and pesticides to the resource costs of food packaging, transport (now a major part of global trade) and retail. Food is essential to life. But the list of environmental costs of food production is a long one: topsoil depletion, erosion and conversion to desert from constant tillage of annual crops; overgrazing; salinization; sodification; waterlogging; high levels of fossil fuel use; reliance on inorganic fertilisers and synthetic organic pesticides; reductions in genetic diversity by the mass use of monocultures; water resource depletion; pollution of waterbodies by run-off and groundwater contamination; social problems including the decline of family farms and weakening of rural communities.[90]

All of these environmental problems associated with industrial agriculture and agribusiness are now being addressed through such movements as sustainable agriculture, organic farming and more sustainable business practices.[91]

ExtinctionsEdit

Although biodiversity loss can be monitored simply as loss of species, effective conservation demands the protection of species within their natural habitats and ecosystems. Following human migration and population growth, species extinctions have progressively increased to a rate unprecedented since the Cretaceous–Tertiary extinction event. Known as the Holocene extinction event this current human-induced extinction of species ranks as one of the worlds six mass extinction events. Some scientific estimates indicate that up to half of presently existing species may become extinct by 2100.[92][93] Current extinction rates are 100 to 1000 times their prehuman levels with more than 10% birds and mammals threatened, about 8% of plants, 5% of fish and more than 20% of freshwater species.[94]

Picture of the now extinct bird the Dodo

The extinct Dodo (Raphus cucullatus)

The 2008 IUCN Red List warns that long-term droughts and extreme weather put additional stress on key habitats and, for example, lists 1,226 bird species as threatened with extinction, which is one-in-eight of all bird species.[95][96] The Red List Index also identifies 44 tree species in Central Asia as under threat of extinction due to over-exploitation and human development and threatening the region's forests which are home to more than 300 wild ancestors of modern domesticated fruit and nut cultivars.[97]

Biological invasionsEdit

Trees infested with Kudzu (Pueraria lobata)

Kudzu (Pueraria lobata) infesting trees in Atlanta, Georgia, USA

In many parts of the industrial world land clearing for agriculture has diminished and here the greatest threat to biodiversity, after climate change, has become the destructive effect of invasive species.[98] Increasingly efficient global transport has facilitated the spread of organisms across the planet. The potential danger of this aspect of globalization is starkly illustrated through the spread of human diseases like HIV AIDS, mad cow disease, bird flu and swine flu, but invasive plants and animals are also having a devastating impact on native biodiversity. Non-indigenous organisms can quickly occupy disturbed land and natural areas where, in the absence of their natural predators, they are able to thrive.[99] At the global scale this issue is being addressed through the Global Invasive Species Information Network but there is improved international biosecurity legislation to minimise the transmission of pathogens and invasive organisms. Also, through CITES legislation there is control the trade in rare and threatened species. Increasingly at the local level public awareness programs are alerting communities, gardeners, the nursery industry, collectors, and the pet and aquarium industries, to the harmful effects of potentially invasive species.[100]

Management of human consumptionEdit

File:Helix of sustainability.png

The underlying driver of direct human impacts on the environment is human consumption.[101] This impact is reduced by not only consuming less but by also making the full cycle of production, use and disposal more sustainable. Consumption of goods and services can be analysed and managed at all scales through the chain of consumption, starting with the effects of individual lifestyle choices and spending patterns, through to the resource demands of specific goods and services, the impacts of economic sectors, through national economies to the global economy.[102] Analysis of consumption patterns relates resource use to the environmental, social and economic impacts at the scale or context under investigation. The ideas of embodied resource use (the total resources needed to produce a product or service), resource intensity (the resources needed for each dollar spent on a good or service), and resource productivity (the amount of good or service produced for a given input of resource) are important tools for understanding the impacts of consumption with simple key resource categories indicating human needs being food, energy, materials and water.

EnergyEdit

Main article: Sustainable energy
Diagram showing the flow of CO2 in an ecosystem

Flow of CO2 in an ecosystem

The Sun's energy, stored by plants (primary producers) during photosynthesis, passes through the food chain to other organisms to ultimately power all living processes. Since the industrial revolution the concentrated energy of the Sun stored in fossilized plants as fossil fuels has been a major driver of technology which, in turn, has been the source of both economic and political power. In 2007 climate scientists of the IPCC concluded that there was at least a 90% probability that atmospheric increase in CO2 was human-induced, mostly as a result of fossil fuel emissions but, to a lesser extent from changes in land use. Stabilizing the world’s climate will require high income countries to reduce their emissions by 60-90% over 2006 levels by 2050 which should hold CO2 levels at 450-650 ppm from current levels of about 380 ppm. Above this level and temperatures could rise by more than Template:Convert/LonAoffDbSoffT to produce “catastrophic” climate change.[103][104] Reduction of current CO2 levels must be achieved against a background of global population increase and developing countries aspiring to energy-intensive high consumption Western lifestyles.[105]

Reducing greenhouse emissions, referred to as decarbonization, is being tackled at all scales, ranging from tracking the passage of carbon through the carbon cycle[106] to the exploration of renewable energies, developing less carbon-hungry technology and transport systems and attempts by individuals to lead carbon neutral lifestyles by monitoring the fossil fuel use embodied in all the goods and services they use.[107]

WaterEdit

Water security and food security are inextricably linked. In the decade 1951-60 human water withdrawals were four times greater than the previous decade. This rapid increase resulted from scientific and technological developments impacting through the economy - especially the increase in irrigated land, growth in industrial and power sectors, and intensive dam construction on all continents. This altered the water cycle of rivers and lakes, affected their water quality and had a significant impact on the global water cycle.[108] Currently towards 35% of human water use is unsustainable, drawing on diminishing aquifers and reducing the flows of major rivers: this percentage is likely to increase if climate change worsens, populations increase, aquifers become progressively depleted and supplies become polluted and unsanitary.[109] From 1961 to 2001 water demand doubled - agricultural use increased by 75%, industrial use by more than 200%, and domestic use more than 400%.[110] Humans currently use 40-50% of the globally available freshwater in the approximate proportion of 70% for agriculture, 22% for industry, and 8% for domestic purposes and the total volume is progressively increasing.[108]

Water efficiency is being improved on a global scale by increased demand management, improved infrastructure, improved water productivity of agriculture, minimising the water intensity (embodied water) of goods and services, addressing shortages in the non-industrialised world, concentrating food production in areas of high productivity; and planning for climate change. At the local level people are becoming more water-self-sufficient by harvesting rainwater and reducing use of mains water.[78][111]

FoodEdit

Feijoada 01

Feijoada - A typical black bean food dish from Brazil

The American Public Health Association (APHA) defines a "sustainable food system"[112][113] as "one that provides healthy food to meet current food needs while maintaining healthy ecosystems that can also provide food for generations to come with minimal negative impact to the environment. A sustainable food system also encourages local production and distribution infrastructures and makes nutritious food available, accessible, and affordable to all. Further, it is humane and just, protecting farmers and other workers, consumers, and communities."[114] Concerns about the environmental impacts of agribusiness and the stark contrast between the obesity problems of the Western world and the poverty and food insecurity of the developing world have generated a strong movement towards healthy, sustainable eating as a major component of overall ethical consumerism.[115] The environmental effects of different dietary patterns depend on many factors, including the proportion of animal and plant foods consumed and the method of food production.[116][117][118][119] The World Health Organization has published a Global Strategy on Diet, Physical Activity and Health which was endorsed by the May 2004 World Health Assembly. It recommends the Mediterranean diet which is associated with health and longevity and is low in meat, rich in fruits and vegetables, low in added sugar and limited salt, and low in saturated fatty acids; the traditional source of fat in the Mediterranean is olive oil, rich in monounsaturated fat. The healthy rice-based Japanese diet is also high in carbohydrates and low in fat. Both diets are low in meat and saturated fats and high in legumes and other vegetables; they are associated with a low incidence of ailments and low environmental impact.[120]

At the global level the environmental impact of agribusiness is being addressed through sustainable agriculture and organic farming. At the local level there are various movements working towards local food production, more productive use of urban wastelands and domestic gardens including permaculture, urban horticulture, local food, slow food, sustainable gardening, and organic gardening.[121][122]

Materials, toxic substances, wasteEdit

FSC Teca Wood in Stainless Steel Talbe

FSC sustainable teca wood from Brazil. Example of correct use of tropical forest resources.

As global population and affluence has increased, so has the use of various materials increased in volume, diversity and distance transported. Included here are raw materials, minerals, synthetic chemicals (including hazardous substances), manufactured products, food, living organisms and waste.[123]

Materials

Sustainable use of materials has targeted the idea of dematerialization, converting the linear path of materials (extraction, use, disposal in landfill) to a circular material flow that reuses materials as much as possible, much like the cycling and reuse of waste in nature.[124] This approach is supported by product stewardship and the increasing use of material flow analysis at all levels, especially individual countries and the global economy.[125]

Toxic substances

Synthetic chemical production has escalated following the stimulus it received during the second World War. Chemical production includes everything from herbicides, pesticides and fertilizers to domestic chemicals and hazardous substances.[126] Apart from the build-up of greenhouse gas emissions in the atmosphere, chemicals of particular concern include: heavy metals, nuclear waste, chlorofluorocarbons, persistent organic pollutants and all harmful chemicals capable of bioaccumulation. Although most synthetic chemicals are harmless there needs to be rigorous testing of new chemicals, in all countries, for adverse environmental and health effects. International legislation has been established to deal with the global distribution and management of dangerous goods.[127][128]

Pyramid diagram showing ways of dealing with waste with the most important ones towards the top

The waste hierarchy

Waste

Every economic activity produces material that can be classified as waste. The average human uses 45-85 tonnes of materials each year.[123] To reduce waste industry, business and government are now mimicking nature by turning the waste produced by industrial metabolism into resource. Dematerialization is being encouraged through the ideas of industrial ecology, ecodesign[129] and ecolabelling (see side bar). In addition to the well-established “reduce, reuse and recycle” shoppers are using their purchasing power for ethical consumerism.[49]

Economic dimensionEdit

Reproduction of painting The Great Fish Market, painted by Jan Brueghel the Elder

The Great Fish Market, painted by Jan Brueghel the Elder

Sustainability interfaces with economics through the social and ecological consequences of economic activity.[15] Sustainability economics represents: "... a broad interpretation of ecological economics where environmental and ecological variables and issues are basic but part of a multidimensional perspective. Social, cultural, health-related and monetary/financial aspects have to be integrated into the analysis."[130] However the concept of sustainability is much broader than the concepts of sustained yield of welfare, resources or profit margins[131] At present the average per capita consumption of people in the developing world is sustainable but population numbers are increasing and individuals are aspiring to high consumption Western lifestyles. The developed world population is only increasing slightly but consumption levels are unsustainable. The challenge for sustainability is to curb and manage Western consumption while raising the standard of living of the developing world without increasing its resource use and environmental impact. This must be done by using strategies and technology that break the link between, on the one hand, economic growth and on the other, environmental damage and resource depletion.[132]

In addressing this issue several key areas have been targeted for economic analysis and reform: the environmental effects of unconstrained economic growth; the consequences of nature being treated as an economic externality; and the possibility of a more ethical economics that takes greater account of the social and environmental consequences of market behaviour.[133]

Decoupling environmental degradation and economic growthEdit

The International Recycle Symbol

International Recycle Symbol

In the second half of the 20th century world population doubled, food production tripled, energy use quadrupled, and overall economic activity quintupled.[134] Historically there has been a close correlation between economic growth and environmental degradation: as communities grow, so the environment declines. This trend is clearly demonstrated on graphs of human population numbers, economic growth, and environmental indicators.[135] Unsustainable economic growth has been starkly compared to the malignant growth of a cancer[136] because it eats away at the Earth's ecosystem services which are its life-support system. There is concern that, unless resource use is checked, modern global civilization will follow the path of ancient civilizations that collapsed through overexploitation of their resource base.[26][137] While conventional economics is concerned largely with economic growth and the efficient allocation of resources, ecological economics has the explicit goal of sustainable scale (rather than continual growth), fair distribution and efficient allocation, in that order.[138][139] The World Business Council for Sustainable Development states that "business cannot succeed in societies that fail".[140] Sustainability studies analyse ways to reduce (decouple) the amount of resource (e.g. water, energy, or materials) needed for the production, consumption and disposal of a unit of good or service whether this be achieved from improved economic management, product design, new technology etc.[141] Ecological economics includes the study of societal metabolism, the throughput of resources that enter and exit the economic system in relation to environmental quality.[142][143]

Nature as an economic externalityEdit

Deforastation of native rain forest in Rio de Janeiro City for extraction of clay for civil construction

Deforestation of native rain forest in Rio de Janeiro City for extraction of clay for civil engineering (2009 picture).

The economic importance of nature is indicated by the use of the expression ecosystem services to highlight the market relevance of an increasingly scarce natural world that can no longer be regarded as both unlimited and free.[144] In general as a commodity or service becomes more scarce the price increases and this acts as a restraint that encourages frugality, technical innovation and alternative products. However, this only applies when the product or service falls within the market system.[145] As ecosystem services are generally treated as economic externalities they are unpriced and therefore overused and degraded, a situation sometimes referred to as the Tragedy of the Commons.[144]

One approach to this dilemma has been the attempt to "internalise" these "externalities" by using market strategies like ecotaxes and incentives, tradeable permits for carbon, water and nitrogen use etc., and the encouragement of payment for ecosystem services. Community currencies such as LETS, a gift economy and Time Banking have also been promoted as a way of supporting local economies and the environment.[146][147] Green economics is another market-based attempt to address issues of equity and the environment.[148] The global recession and a range of government policies that have been connected to that, are likely to bring the biggest annual fall in the world's carbon dioxide emissions in 40 years.[149]

Economic opportunityEdit

Treating the environment as an externality may generate short-term profit at the expense of sustainability.[150] Sustainable business practices, on the other hand, integrate ecological concerns with social and economic ones (i.e., the triple bottom line).[151] Growth that depletes ecosystem services is sometimes termed "uneconomic growth" as it leads to a decline in quality of life.[152][153] Minimising such growth can provide opportunities for local businesses. For example, industrial waste can be treated as an "economic resource in the wrong place". The benefits of waste reduction include savings from disposal costs, fewer environmental penalties, and reduced liability insurance. This may lead to increased market share due to an improved public image.[154][155] Energy efficiency can also increase profits by reducing costs.

The idea of sustainability as a business opportunity has led to the formation of organizations such as the Sustainability Consortium of the Society for Organizational Learning, the Sustainable Business Institute, and the World Council for Sustainable Development.[156] The expansion of sustainable business opportunities can contribute to job creation through the introduction of green-collar workers.[157]

Social dimensionEdit

Sustainability issues are generally expressed in scientific and environmental terms, but implementing change is a social challenge that entails, among other things, international and national law, urban planning and transport, local and individual lifestyles and ethical consumerism.[158] "The relationship between human rights and human development, corporate power and environmental justice, global poverty and citizen action, suggest that responsible global citizenship is an inescapable element of what may at first glance seem to be simply matters of personal consumer and moral choice."[159]

Peace, security, social justiceEdit

Social disruptions like war, crime and corruption divert resources from areas of greatest human need, damage the capacity of societies to plan for the future, and generally threaten human well-being and the environment.[159] Broad-based strategies for more sustainable social systems include: improved education and the political empowerment of women, especially in developing countries; greater regard for social justice notably equity between rich and poor both within and between countries; and intergenerational equity.[59] Depletion of natural resources including fresh water[160] increases the likelihood of “resource wars”.[161] This aspect of sustainability has been referred to as environmental security and creates a clear need for global environmental agreements to manage resources such as aquifers and rivers which span political boundaries, and to protect global systems including oceans and the atmosphere.[162]

Human settlementsEdit

Template:Quote box One approach to sustainable living, exemplified by small-scale urban transition towns and rural ecovillages, seeks to create self-reliant communities based on principles of simple living, which maximise self-sufficiency particularly in food production. These principles, on a broader scale, underpin the concept of a bioregional economy.[163] Other approaches, loosely based around new urbanism, are successfully reducing environmental impacts by altering the built environment to create and preserve sustainable cities which support sustainable transport. Residents in compact urban neighbourhoods drive fewer miles, and have significantly lower environmental impacts across a range of measures, compared with those living in sprawling suburbs.[164]

Ultimately, the degree of human progress towards sustainability will depend on large scale social movements which influence both community choices and the built environment. Eco-municipalities may be one such movement.[165] Eco-municipalities take a systems approach, based on sustainability principles. The eco-municipality movement is participatory, involving community members in a bottom-up approach. In Sweden, more than 70 cities and towns — 25 per cent of all municipalities in the country — have adopted a common set of "Sustainability Principles" and implemented these systematically throughout their municipal operations. There are now twelve eco-municipalities in the United States and the American Planning Association has adopted sustainability objectives based on the same principles.[166]

Human relationship to natureEdit

According to Murray Bookchin, the idea that humans must dominate nature is common in hierarchical societies. Bookchin contends that capitalism and market relationships, if unchecked, have the capacity to reduce the planet to a mere resource to be exploited. Nature is thus treated as a commodity: “The plundering of the human spirit by the market place is paralleled by the plundering of the earth by capital.”[167] Still more basically, Bookchin argued that most of the activities that consume energy and destroy the environment are senseless because they contribute little to quality of life and well being. The function of work is to legitimize, even create, hierarchy. For this reason understanding the transformation of organic into hierarchical societies is crucial to finding a way forward.[168]

Social ecology, founded by Bookchin, is based on the conviction that nearly all of humanity's present ecological problems originate in, indeed are mere symptoms of, dysfunctional social arrangements. Whereas most authors proceed as if our ecological problems can be fixed by implementing recommendations which stem from physical, biological, economic etc., studies, Bookchin's claim is that these problems can only be resolved by understanding the underlying social processes and intervening in those processes by applying the concepts and methods of the social sciences.[169]

Deep ecology establishes principles for the well-being of all life on Earth and the richness and diversity of life forms. This is only compatible with a substantial decrease of the human population and the end of human interference with the nonhuman world. To achieve this, deep ecologists advocate policies for basic economic, technological, and ideological structures that will improve the quality of life rather than the standard of living. Those who subscribe to these principles are obliged to make the necessary change happen.[170]

TransitionEdit

Picture showing smoke from chimneys and wind turbines indicating old and new human uses of the atmosphere

Old and new approaches to human use of the atmosphere

The earth has a finite capacity to provide resources and to absorb waste, and human demands already exceed that capacity.[171] Current lifestyles in the developed world, to which many people in the developing world also aspire, rely on depleting natural capital and are unsustainable.[172] The United Nations has stated, in the Millennium Declaration, that "current unsustainable patterns of production and consumption must be changed".[173] Yet weight of information and scientific evidence is often insufficient to produce necessary social change, especially if that change entails moving people out of their comfort zones.[174] This may be due to high systemic change resistance.[175]


At the global level several key principles have emerged to guide sustainability efforts:

  • Intergenerational equity - providing future generations with the same environmental potential as presently exists
  • Decoupling economic growth from environmental degradation - managing economic growth to be less resource intensive and less polluting
  • Integration of all pillars - integrating environmental, social and economic sectors when developing sustainability policies
  • Ensuring environmental adaptability and resilience - maintaining and enhancing the adaptive capacity of the environmental system
  • Preventing irreversible long-term damage to ecosystems and human health
  • Ensuring distributional equity - avoiding unfair or high environmental costs on vulnerable populations
  • Accepting global responsibility - assuming responsibility for environmental effects that occur outside areas of jurisdiction
  • Education and grassroots involvement - people and communities investigating problems and developing new solutions[176]

There is a wealth of advice available to individuals wishing to reduce their personal impact on the environment through small, cheap and easily achievable steps.[177][178][179] But the transition required to reduce global human consumption to within sustainable limits involves much larger changes, at all levels and contexts of society.[180] The United Nations has recognised the central role of education, and have declared a decade of education for sustainable development, 2005–2014, </font>which aims to "challenge us all to adopt new behaviours and practices to secure our future".[181] The Worldwide Fund for Nature proposes a strategy for sustainability that goes beyond education to tackle underlying individualistic and materialistic societal values head-on and strengthen people's connections with the natural world.[182] While The Transition Decade, an alliance of various community, social, political and environmental groups in Australia, optimistically seeks to transition to a sustainable Australia from 2010 to 2020. The level of change required to safeguard the life-supporting capacity of the Earth sets new challenges for community and political structures.[183]

See alsoEdit

NotesEdit

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  146. Robert Costanza et al., "Complementary Currencies as a Method to Improve Local Sustainable Economic Welfare", University of Vermont, Burlington, VT, December 12th, 2003.
  147. David Boyle, "Sustainability and social assets: the potential of time banks and co-production", Grassroots Initiatives for Sustainable Development, June 10, 2005.
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  149. Black, Richard (21 September 2009). "Recession and policies cut carbon". BBC. http://news.bbc.co.uk/1/hi/sci/tech/8267475.stm. Retrieved 2009-10-13. 
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  152. Daly, H. (2007). Ecological economics: the concept of scale and its relation to allocation, distribution, and uneconomic growth. pp. 82–103. In H. Daly. Ecological Economics and Sustainable Development: Selected Essays of Herman Daly. Cheltenham, UK: Edward Elgar.
  153. Daly, H. (1999). Uneconomic growth and the built environment: in theory and in fact. In C.J. Kibert (ed.). Reshaping the Built Environment: Ecology, Ethics, and Economics. Washington DC: Island Press.
  154. Jackson, T. (February 2008). Tim Jackson, Roland Clift, "Where's the Profit in lndustrial Ecology?" Journal of Industrial Ecology 2:(1): 3–5.
  155. Hargroves, K. & Smith, M. (eds.) (2005). The Natural Advantage of Nations: Business Opportunities, Innovation and Governance in the 21st Century. London: Earthscan/James&James. ISBN 1844071219. (See the book's online companion)
  156. See, for example: Zhexembayeva, N. (May 2007). "Becoming Sustainable: Tools and Resources for Successful Organizational Transformation." Case Western University, Center for Business as an Agent of World Benefit 3(2) and websites of The Sustainable Business Institute, and the WBCSD." Retrieved on: 2009-04-01.
  157. Leo Hickman, "The future of work is green" The Guardian, February, 2009.
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  160. "Water and Political Conflicts" from United Nations Environment Programme 2008 "Vital Water Graphics" Retrieved on: 2009-03-16.
  161. Billon, P. (ed.) (2005) The Geopolitics of Resource Wars Retrieved on: 2009-04-05.
  162. Kobtzeff, O. (2000). “Environmental Security and Civil Society”. In Gardner, H. (ed.) Central and South-central Europe in Transition. Westport, Connecticut: Praeger, pp. 219–296.
  163. Sale, Kirkpatrick (24 February 2006). "Economics of Scale vs. the Scale of Economics - Towards Basic Principles of a Bioregional Economy". Vermont Commons. http://www.vtcommons.org/journal/2006/02/kirkpatrick-sale-economics-scale-vs-scale-economics-towards-basic-principles-bioregi. Retrieved 2009-10-13. 
  164. Ewing, R "Growing Cooler - the Evidence on Urban Development and Climate Change". Retrieved on: 2009-03-16.
  165. LaColla, T. "It’s Easy to be Green! Eco-Municipalities: Here to Stay". theplanningcommission.org. Retrieved on: 2009-03-16.
  166. James, S. (2003). "Eco-municipalities: Sweden and the United States: A Systems Approach to Creating Communities". Retrieved on: 2009-03-16.
  167. Bookchin (2004) pp. 24–25.
  168. Bookchin (2005)
  169. Bookchin (2007) p. 19.
  170. Devall & Sessions (1985) p. 70.
  171. Millennium Ecosystem Assessment, pp. 1–85.
  172. Sachs, J. (2008) "Are Malthus's Predicted 1798 Food Shortages Coming True?" Scientific American Magazine, September 2008. Retrieved 2009-04-06.
  173. Millennium Declaration of the United Nations Retrieved on: 2009-04-06.
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ReferencesEdit

  • Adams, W. M. and Jeanrenaud, S. J. (2008). Transition to Sustainability: Towards a Humane and Diverse World. Gland, Switzerland: IUCN. 108 pp. ISBN 9782831710723.
  • Blewitt, J. (2008). Understanding Sustainable Development. London: Earthscan. ISBN 9781844074549.
  • Blood, K. (2001). Environmental Weeds. Mt Waverley, Victoria: C.H. Jerram & Associates. ISBN 0957908601. An example of a local guide to invasive plants.
  • Botkin, D.B. (1990). Discordant Harmonies, a New Ecology for the 21st century. New York: Oxford University Press. ISBN 9780195074697.
  • Bookchin, M. (2004). Post Scarcity Anarchism. Oakland: AK Press, pp. 24–25. ISBN 9781904859062.
  • Bookchin, M. (2005). The Ecology of Freedom: the emergence and dissolution of hierarchy." Oakland: AK Press. ISBN 1904859267.
  • Bookchin, M. (2007). Social Ecology and Communalism. Oakland: AK Press, p. 19. ISBN 9781904859499.
  • Brower, M. & Leon, W. (1999). The Consumer's Guide to Effective Environmental Choices: Practical Advice from the Union of Concerned Scientists. New York: Three Rivers Press. ISBN 060980281X.
  • Clark, D. (2006). A Rough Guide to Ethical Living. London: Penguin. ISBN 9781843537922
  • Clarke, R. & King, J. (2006). The Atlas of Water. London: Earthscan. ISBN 9781844071333.
  • Costanza, R. et al. (2007). An introduction to ecological economics. This is an online editable text available on the Encyclopaedia of the Earth at [8]. First published in 1997 by St. Lucie Press and the International Society for Ecological Economics. ISBN 1884015727.
  • Daly, H. & J. Cobb (1989). For the Common Good: Redirecting the Economy Toward Community, the Environment and a Sustainable Future. Boston: Beacon Press. ISBN 0807047031.
  • Daly, H.E. & Farley, J. (2004). Ecological economics: principles and applications. Washington: Island Press. ISBN 1559633123.
  • Devall, W. and G. Sessions (1985). Deep Ecology: Living As If Nature Mattered. Layton, Utah: Gibbs Smith, p. 70. ISBN 9780879052478.
  • Diamond, J. (2005). Collapse: How Societies Choose to Fail or Succeed. New York: Viking Books. ISBN 1586638637.
  • Diamond, J. (1997). Guns, Germs and Steel: the Fates of Human Societies. New York: W.W. Norton & Co. ISBN 0393061310.
  • Emden, H.F. van & Peakall, D.B. (1996). Beyond Silent Spring. Berkeley: Springer. ISBN 9780412728105.
  • Fuad-Luke, A. (2006). The Eco-design Handbook. London: Thames & Hudson. ISBN 9780500285213.
  • Goodall, C. (2007). How to Live a Low-carbon Life. London: Earthscan. ISBN 9781844074266.
  • Goudie A. (2005). The Human Impact on the Natural Environment. 6th ed. Oxford: Blackwell Publishing. ISBN 9781405127042.
  • Groombridge, B. & Jenkins, M.D. (2002). World Atlas of Biodiversity. Berkeley: University of California Press. ISBN 9780520236684.
  • Hak, T. et al. (2007). Sustainability Indicators, SCOPE 67. London: Island Press. ISBN 1597261319.
  • Hassall, K.A. (1990). The Biochemistry and Uses of Pesticides. London: Macmillan. ISBN 0333497899.
  • Hawken, P, Lovins, A.B. & L.H. (1999). Natural Capitalism: Creating the next Industrial Revolution. Snowmass, USA: Rocky Mountain Institute. ISBN 0316353000.
  • Krebs, C.J. (2001). Ecology: the Experimental Analysis of Distribution and Abundance. Sydney: Benjamin Cummings. ISBN 0321042891.
  • Leakey, R. & Lewin, R. (1995). The Sixth Extinction: Patterns of Life and the Future of Humankind. New York: Bantam Dell Publishing Group. ISBN 0385468091
  • Lindenmayer, D. & Burgman, M. (2005). Practical Conservation Biology. Collingwood, Victoria: CSIRO Publishing. ISBN 0643090894.
  • Lutz W., Sanderson W.C., & Scherbov S. (2004). The End of World Population Growth in the 21st Century London: Earthscan. ISBN 1844070891.
  • Macy, J. & Young Brown, M. (1998). Coming Back to Life: Practices to Reconnect Our Lives, Our World. Gabriola Island: New Society Publishers, pp. 25–37. ISBN 086571391X.
  • Mason, J. & Singer, P. (2006). The Way We Eat: Why Our Food Choices Matter. London: Random House. ISBN 157954889X
  • Meadows, D.H., D.L. Meadows, J. Randers, and W. Behrens III. (1972). The Limits to Growth. New York: Universe Books. ISBN 0876631650.
  • Nordhaus, W. and J. Tobin (1972) Is growth obsolete?. Columbia University Press, New York.
  • Pearce, D., Barbier, E.. & Markandya, A. (2000). Sustainable Development Economics and Environment in the Third World. London: Earthscan. ISBN 9781853830884.
  • Porritt, J. (2006). Capitalism as if the world mattered. London: Earthscan. ISBN 9781844071937.
  • Randall, R. (2002). A Global Compendium of Weeds. Meredith, Victoria, Australia: R.G. & F.J. Richardson. ISBN 9780958743983.
  • Smil, V. (2000). Cycles of Life. New York: Scientific American Library. ISBN 9780716750796.
  • Soederbaum, P. (2008). Understanding Sustainability Economics. London: Earthscan. ISBN 9781844076277.
  • Tudge, C. (2004). So Shall We Reap. London: Penguin Books. ISBN 0141009500.
  • Wright, R. (2004). A Short History of Progress. Toronto: Anansi. ISBN 0887847064.
  • Wilson, E.O. (2002). The Future of Life. New York: Knopf. ISBN 0679450785.

Further readingEdit

  • Atkinson, G., Dietz, S. & Neumayer, E. (2007). Handbook of Sustainable Development. Cheltenham: Edward Elgar. ISBN 9781843765776.
  • Bartlett, A. (1998). Reflections on Sustainability, Population Growth, and the Environment—Revisited revised version (January 1998) paper first published in Population & Environment 16(1): 5–35. Retrieved on: 2009-03-12.
  • Benyus, J. (1997). Biomimicry: Innovations Inspired by Nature. New York: William Morrow. ISBN 0060533226.
  • Blackburn, W.R. (2007). The Sustainability Handbook. London: Earthscan. ISBN 9781844074952.
  • Costanza, R., Graumlich, L.J. & Steffen, W. (eds), (2007). Sustainability or Collapse? An Integrated History and Future of People on Earth. Cambridge, MA.: MIT Press. ISBN 9780262033664.
  • Norton, B. (2005). Sustainability, A Philosophy of Adaptive Ecosystem Management. Chicago: The University of Chicago Press. ISBN 9780226595214.

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