Ecological footprint

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The ecological footprint is a measure of human demand on the Earth's ecosystems. It compares human demand with planet Earth's ecological capacity to regenerate. It represents the amount of biologically productive land and sea area needed to regenerate the resources a human population consumes and to absorb and render harmless the corresponding waste. Using this assessment, it is possible to estimate how much of the Earth (or how many planet Earths) it would take to support humanity if everybody lived a given lifestyle. For 2005, humanity's total ecological footprint was estimated at 1.3 planet Earths - in other words, humanity uses ecological services 1.3 times faster than Earths can renew them.[1] Every year, this number is recalculated - with a three year lag due to the time it takes for the UN to collect and publish all the underlying statistics.

While the term ecological footprint is widely used,[2] methods of measurement vary. However, calculation standards are now emerging to make results more comparable and consistent.[3]


[edit] Ecological footprint analysis

Ecological footprint for different nations compared to their HDI. Recent evidence[citation needed] suggests that improvements in the Human Development Index in most cases generally results in an increase in its ecological footprint.

Personal Environmental Impact Accounting, similar in concept to the ecological footprint, was developed in the early 1990s by Don Lotter and released in 1992 as EnviroAccount software. The first academic publication about the ecological footprint was by William Rees in 1992.[4] The ecological footprint concept and calculation method was developed as the PhD dissertation of Mathis Wackernagel, under Rees at the University of British Columbia in Vancouver, Canada, from 1990-1994.[5] Originally, Wackernagel and Rees called the concept "appropriated carrying capacity".[6] To make the idea more accessible, Rees came up with the term "ecological footprint," inspired by a computer technician who praised his new computer's "small footprint on the desk."[7] In early 1996, Wackernagel and Rees published the book Our Ecological Footprint: Reducing Human Impact on the Earth.[8]

Ecological footprint analysis compares human demand on nature with the biosphere's ability to regenerate resources and provide services. It does this by assessing the biologically productive land and marine area required to produce the resources a population consumes and absorb the corresponding waste, using prevailing technology. Footprint values at the end of a survey are categorized for Carbon, Food, Housing, and Goods and Services as well as the total footprint number of Earths needed to sustain the world's population at that level of consumption. This approach can also be applied to an activity such as the manufacturing of a product or driving of a car. This resource accounting is similar to life cycle analysis wherein the consumption of energy, biomass (food, fiber), building material, water and other resources are converted into a normalized measure of land area called 'global hectares' (gha).

Per capita ecological footprint (EF) is a means of comparing consumption and lifestyles, and checking this against nature's ability to provide for this consumption. The tool can inform policy by examining to what extent a nation uses more (or less) than is available within its territory, or to what extent the nation's lifestyle would be replicable worldwide. The footprint can also be a useful tool to educate people about carrying capacity and over-consumption, with the aim of altering personal behavior. Ecological footprints may be used to argue that many current lifestyles are not sustainable. Such a global comparison also clearly shows the inequalities of resource use on this planet at the beginning of the twenty-first century.

In 2005, the average biologically productive area per person worldwide was approximately 2.1 global hectares (gha) per capita. The U.S. footprint per capita was 9.4 gha, and that of Switzerland was 5.0 gha per person, while China's was 2.1 gha per person.[9] [10] The WWF claims that the human footprint has exceeded the biocapacity (the available supply of natural resources) of the planet by 20%.[11] Wackernagel and Rees originally estimated that the available biological capacity for the 6 billion people on Earth at that time was about 1.3 hectares per person, which is smaller than the 2.1 global hectares published for 2005, because the initial studies did neither use global hectares nor did they include bioproductive marine areas.[8]

A number of NGO websites allow estimation of one's ecological footprint (see Footprint Calculator, below).

Ecological footprinting is now widely used around the globe as an indicator of environmental sustainability.[citation needed] It can be used to measure and manage the use of resources throughout the economy. It can be used to explore the sustainability of individual lifestyles, goods and services, organizations, industry sectors, neighborhoods, cities, regions and nations.[12] Since 2006, a first set of ecological footprint standards exist that detail both communication and calculation procedures. They are available at and were developed in a public process facilitated by Global Footprint Network and its partner organizations.

[edit] Methodology

The ecological footprint accounting method at the national level is described in the Living Planet Report or in more detail in Global Footprint Network's [6]. The national accounts committee of Global Footprint Network has also published a research agenda on how the method will be improved. [13]

There have been differences in the methodology used by various ecological footprint studies. Examples include how sea area should be counted, how to account for fossil fuels, how to account for nuclear power (many studies simply consider it to have the same ecological footprint as fossil fuels), which data sources used, when average global numbers or local numbers should be used when looking at a specific area, how space for biodiversity should be included, and how imports/exports should be accounted for.[7].[8] However, with the new footprint standards, the methods are converging.[citation needed]

[edit] Ecological footprint studies in the United Kingdom

The UK's average ecological footprint is 5.45 global hectares per capita (gha) with variations between regions ranging from 4.80 gha (Wales) to 5.56 gha (East England).[10] Two recent studies have examined relatively low-impact small communities. BedZED, a 96-home mixed-income housing development in South London, was designed by Bill Dunster Architects and sustainability consultants BioRegional for the Peabody Trust. Despite being populated by relatively "mainstream" home-buyers, BedZED was found to have a footprint of 3.20 gha due to on-site renewable energy production, energy-efficient architecture, and an extensive green lifestyles program that included on-site London's first carsharing club. The report did not measure the added footprint of the 15,000 visitors who have toured BedZED since its completion in 2002. Findhorn Ecovillage, a rural intentional community in Moray, Scotland, had a total footprint of 2.56 gha, including both the many guests and visitors who travel to the community to undertake residential courses there and the nearby campus of Cluny Hill College. However, the residents alone have a footprint of 2.71 gha, a little over half the UK national average and one of the lowest ecological footprints of any community measured so far in the industrialized world [14][15] Keveral Farm, an organic farming community in Cornwall, was found to have a footprint of 2.4 gha, though with substantial differences in footprints among community members.[16]

[edit] Discussion

Early criticism was published by van den Bergh and Verbruggen in 1999;[17] another criticism was published in 2008.[18] A more complete review commissioned by the Directorate-General for the Environment (European Commission) and published in June 2008 provides the most updated independent assessment of the method.[19] A number of countries have engaged in research collaborations to test the validity of the method. This includes Switzerland, Germany, United Arab Emirates, and Belgium. [20]

Grazi et al. (2007) have performed a systematic comparison of the ecological footprint method with spatial welfare analysis that includes environmental externalities, agglomeration effects and trade advantages. [21] They find that the two methods can lead to very distinct, and even opposite, rankings of different spatial patterns of economic activity. However, this should not be surprising, since the two methods address different research questions.

Calculating the ecological footprint for densely populated areas, such as a city or small country with a comparatively large population — e.g. New York and Singapore respectively — may lead to the perception of these populations as "parasitic". This is because these communities have little intrinsic biocapacity, and instead must rely upon large hinterlands. Critics argue that this is a dubious characterization since mechanized rural farmers in developed nations may easily consume more resources than urban inhabitants, due to transportation requirements and the unavailability of economies of scale. Furthermore, such moral conclusions seem to be an argument for autarky. Some even take this train of thought a step further, claiming that the Footprint denies the benefits of trade. Therefore, the critics argue that that the Footprint can only be applied globally.[22]

The method seems to reward the replacement of original ecosystems with high-productivity agricultural monocultures by assigning a higher biocapacity to such regions. For example, replacing ancient woodlands or tropical forests with monoculture forests or plantations may improve the ecological footprint. Similarly, if organic farming yields were lower than those of conventional methods, this could result in the former being "penalized" with a larger ecological footprint.[23] Of course, this insight, while valid, stems from the idea of using the footprint as one's only metric. If the use of ecological footprints are complemented with other indicators, such as one for biodiversity, the problem could maybe be solved. Indeed, WWF's Living Planet Report complements the biennial Footprint calculations with the Living Planet Index of biodiversity.[24] Manfred Lenzen and Shauna Murray have created a modified Ecological Footprint that takes biodiversity into account for use in Australia [25].

Although the ecological footprint model treats nuclear power the same as it treats coal power, [26] the actual real world effects of the two are radically different. A life cycle analysis centered around the Swedish Forsmark Nuclear Power Plant estimated carbon dioxide emissions at 3.10 g/kWh[27] and 5.05 g/kWh in 2002 for the Torness Nuclear Power Station.[28] This compares to 11 g/kWh for hydroelectric power, 950 g/kWh for installed coal, 900 g/kWh for oil and 600 g/kWh for natural gas generation in the United States in 1999.[29]

The Vattenfall study found Nuclear, Hydro, and Wind to have far less greenhouse emissions than other sources represented.

The Swedish utility Vattenfall did a study of full life cycle emissions of Nuclear, Hydro, Coal, Gas, Solar Cell, Peat and Wind which the utility uses to produce electricity. The net result of the study was that nuclear power produced 3.3 grams of carbon dioxide per KW-Hr of produced power. This compares to 400 for natural gas and 700 for coal (according to this study). The study also concluded that nuclear power produced the smallest amount of CO2 of any of their electricity sources. [30]

Claims exist that the problems of nuclear waste do not come anywhere close to approaching the problems of fossil fuel waste.[31][32] A 2004 article from the BBC states: "The World Health Organization (WHO) says 3 million people are killed worldwide by outdoor air pollution annually from vehicles and industrial emissions, and 1.6 million indoors through using solid fuel."[33] In the U.S. alone, fossil fuel waste kills 20,000 people each year.[34] A coal power plant releases 100 times as much radiation as a nuclear power plant of the same wattage.[35] It is estimated that during 1982, US coal burning released 155 times as much radioactivity into the atmosphere as the Three Mile Island incident.[36] In addition, fossil fuel waste causes global warming, which leads to increased deaths from hurricanes, flooding, and other weather events. The World Nuclear Association provides a comparison of deaths due to accidents among different forms of energy production. In their comparison, deaths per TW-yr of electricity produced from 1970 to 1992 are quoted as 885 for hydropower, 342 for coal, 85 for natural gas, and 8 for nuclear.[37]

Although the ecological footprint model treats water as a very scarce resource[26], there are other sources that disagree. A January 17, 2008, article in the Wall Street Journal states, "World-wide, 13,080 water desalination plants produce more than 12 billion U.S. gallons (45,000,000 m³) of water a day, according to the International Desalination Association." [38] A March 21, 2008 article in the Las Vegas Sun states that the cost of desalinizing 1,000 gallons of water is only US$3.06. [39] Even people who live far away from the ocean are benefiting from desalination. For example, after being desalinized at Jubail, Saudi Arabia, water is pumped 200 miles inland though a pipeline to the capital city of Riyadh. [40]

[edit] Ecological footprint by country

The total world ecological footprint is 2.7 global hectares per capita and the ecological reserve, or biocapacity - the amount of land available for production, is in deficit at 0.6 global hectares per capita.[41]

[edit] See also

[edit] References

  1. ^ "Data Sources". Global Footprint Network. 2008-10-29. Retrieved on 2008-10-31. 
  2. ^ United Nations Environment Programme UNEP reports. [1]
  3. ^ [2]
  4. ^ Rees, William E. (October 1992). "Ecological footprints and appropriated carrying capacity: what urban economics leaves out". Environment and Urbanisation 4 (2): 121–130. doi:10.1177/095624789200400212. 
  5. ^ Wackernagel, M. (1994), Ecological Footprint and Appropriated Carrying Capacity: A Tool for Planning Toward Sustainability. Ph.D. Thesis, School of Community and Regional Planning. The University of British Columbia. Vancouver, Canada.
  6. ^ Wackernagel, Mathis, 1991. "Land Use: Measuring a Community's Appropriated Carrying Capacity as an Indicator for Sustainability;" and "Using Appropriated Carrying Capacity as an Indicator, Measuring the Sustainability of a Community." Report I & II to the UBC Task Force on Healthy and Sustainable Communities, Vancouver.
  7. ^ William Safire, On Language: Footprint, New York Times Magazine, February 17, 2008,
  8. ^ a b Wackernagel, Mathis & Rees, William (1996)"Our Ecological Footprint" (New Society Press)
  9. ^ or Living Planet Report 2008 outlines scenarios for humanity's future. Global Footprint Network. Retrieved: 2009-02-15
  10. ^ a b Chambers, N. et al (2004) Scotland’s Footprint. Best Foot Forward. ISBN 0-9546042-0-2.
  11. ^ Global ecosystems 'face collapse' BBC News. Retrieved: 2007-05-18.
  12. ^ Global Footprint Network "Ecological Footprint: Overview." Retrieved on August 1, 2007.
  13. ^ Justin Kitzes, Alessandro Galli, Marco Bagliani, John Barrett, Gorm Dige, Sharon Ede, Karlheinz Erb, Stefan Giljum, Helmut Haberl, Chris Hails, Sally Jungwirth, Manfred Lenzen, Kevin Lewis, Jonathan Loh, Nadia Marchettini, Hans Messinger, Krista Milne, Richard Moles, Chad Monfreda, Dan Moran, Katsura Nakano, Aili Pyhälä, William Reese, Craig Simmons, Mathis Wackernagel, Yoshihiko Wada, Connor Walsh and Tommy Wiedmann. A Research Agenda for Improving National Ecological Footprint Accounts Retrieved: 2007-11-11
  14. ^ Findhorn eco-footprint is ‘world’s smallest’ Sunday Herald, Aug 11, 2008."A new expert study says the multinational community's ecological footprint is half the UK average. This means Findhorn uses 50% fewer resources and creates 50% less waste than normal."
  15. ^ Tinsley, S. and George, H. (2006) Ecological Footprint of the Findhorn Foundation and Community. Moray. Sustainable Development Research Centre, UHI Millennium Institute.
  16. ^ Radical Routes (2006) How to work out your Ecological Footprint. Leeds. Radical Routes Ltd. Available to order or download on the Radical Routes web site
  17. ^ J.C.J.M. van den Bergh and H. Verbruggen (1999), Spatial sustainability, trade and indicators: an evaluation of the ‘ecological footprint’, Ecological Economics, Vol. 29(1): 63-74.[3][4][5]
  18. ^ Fiala, N. (2008). "Measuring sustainability: Why the ecological footprint is bad economics and bad environmental science". Ecological Economics 67 (4): 519–525. doi:10.1016/j.ecolecon.2008.07.023. 
  19. ^ Analysis of the potential of the Ecological Footprint and related assessment tools for use in the EU’s Thematic Strategy on the Sustainable Use of Natural Resources is available at:
  20. ^
  21. ^ F. Grazi, J.C.J.M. van den Bergh and P. Rietveld (2007). Welfare economics versus ecological footprint: modeling agglomeration, externalities and trade. Environmental and Resource Economics 38(1): 135-153.
  22. ^ Planning and Markets: Peter Gordon and Harry W. Richardson
  23. ^ Lenzen, M., C. Borgstrom Hansson and S. Bond (2006) On the bioproductivity and land-disturbance metrics of the Ecological Footprint. University of Sydney, ISA Research Paper, June, 06, in collaboration with WWF. Retrieved: 2007-06-04.
  24. ^ Loh, J., R. Green, T. Ricketts, J. Lamoreux, M. Jenkins, V. Kapos and J. Randers (2005) The Living Planet Index: using species population time series to track trends in biodiversity. Philosophical Transactions of the Royal Society. 360, 289–295. Online edition published February, 2005. Retrieved on: August 4, 2007.
  25. ^ Lenzen, Manfred & Murray Shauna A. (2001), "A modified ecological footprint method and its application to Australia" (Ecological Economics 37 (2001) 229–255)
  26. ^ a b Questions and Answers, Global Footprint Network
  27. ^ Vattenfall 2004, Forsmark EPD for 2002 and SwedPower LCA data 2005.
  28. ^ Energy Analysis of Power Systems accessed 20 October 2007
  29. ^ Electric Power Industry CO2 Emissions accessed 20 October 2007
  30. ^ Greenhouse Emissions of Nuclear Power
  31. ^ David Bodansky. "The Environmental Paradox of Nuclear Power". American Physical Society. Retrieved on 2008-01-31. "(reprinted from Environmental Practice, vol. 3, no. 2 (June 2001), pp.86–88 {Oxford University Press))" 
  32. ^ "Some Amazing Facts about Nuclear Power". August 2002. Retrieved on 2008-01-31. 
  33. ^ Alex Kirby (13 December 2004,). ""Pollution: A life and death issue"". BBC News. Retrieved on 2008-01-31. 
  34. ^ Don Hopey (June 29, 2005). ""State sues utility for U.S. pollution violations"". Pittsburgh Post-Gazette. Retrieved on 2008-01-31. 
  35. ^ Alex Gabbard. "Coal Combustion: Nuclear Resource or Danger". Oak Ridge National Laboratory. Retrieved on 2008-01-31. 
  36. ^ Nuclear proliferation through coal burning — Gordon J. Aubrecht, II, Ohio State University
  37. ^ "Safety of Nuclear Power Reactors". 
  38. ^ [ Wall Street Journal - Water, Water, Everywhere...]
  39. ^ Desalination gets a serious look, Las Vegas Sun, March 21, 2008
  40. ^ Desalination is the Solution to Water Shortages, redOrbit, May 2, 2008
  41. ^ "Data Sources". Global Footprint Network. 2008-10-29. Retrieved on 2008-10-31. 
  • Rees, W. E. (1992) "Ecological footprints and appropriated carrying capacity: what urban economics leaves out," Environment and Urbanisation. 4(2), Oct. 1992. Available at Sage Journals Online [9]
  • Wackernagel, M. and W. Rees. 1996. Our Ecological Footprint: Reducing Human Impact on the Earth. Gabriola Island, BC: New Society Publishers. ISBN 0-86571-312-X.
  • Wackernagel, M. (1994), Ecological Footprint and Appropriated Carrying Capacity: A Tool for Planning Toward Sustainability. Ph.D. Thesis. School of Community and Regional Planning. The University of British Columbia.
  • WWF, Global Footprint Network, Zoological Society of London (2006) Living Planet Report 2006. WWF Gland, Switzerland. (downloadable in 11 languages via
  • Lenzen, M. and Murray, S. A. 2003. 'The Ecological Footprint - Issues and Trends.' ISA Research Paper 01-03
  • Chambers, N., Simmons, C. and Wackernagel, M. (2000), Sharing Nature's Interest: Ecological Footprints as an Indicator of Sustainability. Earthscan, London ISBN 1-85383-739-3 (see also
  • J.C.J.M. van den Bergh and H. Verbruggen (1999), 'Spatial sustainability, trade and indicators: an evaluation of the ‘ecological footprint’,' Ecological Economics, Vol. 29(1): 63-74.
  • F. Grazi, J.C.J.M. van den Bergh and P. Rietveld (2007). Welfare economics versus ecological footprint: modeling agglomeration, externalities and trade. Environmental and Resource Economics, Vol. 38(1): 135-153.

[edit] Further reading

  • Rees, W. E. and M. Wackernagel (1994) Ecological footprints and appropriated carrying capacity: Measuring the natural capital requirements of the human economy, in Jansson, A. et al. Investing in Natural Capital: The Ecological Economics Approach to Sustainability. Washington D.C.:Island Press. ISBN 1559633166
  • Ohl, B., Wolf, S., & Anderson, W. 2008. A modest proposal: global rationalization of ecological footprint to eliminate ecological debt. Sustainability: Science, Practice, & Policy 4(1):5-16. Published online April 3, 2008

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