mic_none

Overshoot (population) Source: en.wikipedia.org/wiki/Overshoot_(population)

In environmental science, the concept of overshoot means demand in excess of regeneration. It can apply to animal populations and people. Environmental science studies to what extent human populations through their resource consumption have risen above the sustainable use of resources. For people, "overshoot" is that portion of their demand or ecological footprint which must be eliminated to be sustainable.[1][2] Excessive demand leading to overshoot is driven by both consumption and population.[3]

A decline in population as a consequence of overshoot has been termed 'collapse'. The trajectory undergone by such a population has been called 'overshoot-and-collapse'. A collapse, as much as overshoot, can be the result of different conditions, a particular but not synonymous case of collapse is the Malthusian catastrophe.[citation needed]

Overshoot can occur due to lag effects. Reproduction rates may remain high relative to the death rate.[4] Entire ecosystems may be severely affected and sometimes reduced to less-complex states due to prolonged overshoot.[5] The eradication of disease can trigger overshoot when a population suddenly exceeds the land's carrying capacity. An example of this occurred on the Horn of Africa when smallpox was eliminated. A region that had supported around 1 million pastoralists for centuries was suddenly expected to support 14 million people. The result was overgrazing, which led to soil erosion.[6]

Human overshoot[edit]

The 1972 book The Limits to Growth discussed the limits to growth of society as a whole. This book included a computer-based model which predicted that the Earth would reach a carrying capacity of ten to fourteen billion people after some two hundred years, after which the human population would collapse.[7] The model was based on five variables: "population, food production, industrialization, pollution, and consumption of non-renewable natural resources".[8]: 25  This simulation modelled human populations after the overshoot and collapse seen in all unmoderated species. It was highly controversial and generally dismissed by economists.[9]

William R. Catton, Jr., a sociologist, wrote about relationships between human societies and their environment, as well as his beliefs that there were too many people and more needed to die, in his 1980 book Overshoot: The Ecological Basis of Revolutionary Change. He wrote that humanity would overshoot Earth's carrying capacity, due to both overpopulation and overconsumption.[10][11][12]

The Global Footprint Network purports to be able to measure how much the human economy demands against what the Earth can renew.[13][14] The Optimum Population Trust (now called Population Matters) has listed what they believe is the overshoot (overpopulation) of a number of countries, based on the above.[15]

A widely discussed[16] study published in January 2021 in Frontiers in Conservation Science, emphasizes the significance of overshoot stating that "simultaneous with population growth, humanity's consumption as a fraction of Earth's regenerative capacity has grown from ~ 73% in 1960 to 170% in 2016, with substantially greater per-person consumption in countries with highest income."[17] These numbers are based on recent Ecological Footprint studies.[18] The Frontiers in Conservation Science publication explains that "[t]his massive ecological overshoot is largely enabled by the increasing use of fossil fuels. These convenient fuels have allowed us to decouple human demand from biological regeneration: 85% of commercial energy, 65% of fibers, and most plastics are now produced from fossil fuels."[17]

As a possible cause for societal collapse, overshoot has been scholarly discussed, but has not been found having been the cause for historic cases of collapse.[19]

Predictions of scarcity[edit]

Greater Los Angeles lies on a coastal mediterranean savannah with a small watershed that is able to support at most one million people on its own water; as of 2015, the area has a population of over 18 million. Researchers predict that similar cases of resource scarcity will grow more common as the world population increases.[20]

In his 1798 work An Essay on the Principle of Population, the British scholar Thomas Malthus incorrectly predicted that continued population growth would exhaust the global food supply by the mid-19th century. Malthus wrote the essay to refute what he considered the unattainable utopian ideas of William Godwin and Marquis de Condorcet, as presented in Political Justice and The Future Progress of the Human Mind. In 1968, Paul R. Ehrlich reprised Malthus' argument in The Population Bomb, predicting that mass global famine would occur in the 1970s and 1980s.[21]

The predictions of Ehrlich and other neo-Malthusians were vigorously challenged by a number of economists, notably Julian Lincoln Simon, and advances in agriculture, collectively known as the Green Revolution, forestalled any potential global famine in the late 20th century. Between 1950 and 1984, as the Green Revolution transformed agriculture around the world, grain production increased by over 250%.[22] The world population has grown by over four billion since the beginning of the Green Revolution, but food production has so far kept pace with population growth. Most scholars believe that, without the Revolution, there would be greater levels of famine and malnutrition than the UN presently documents.[23] However, neo-Malthusians point out that fossil fuels provided the energy for the Green Revolution, in the form of natural gas-derived fertilizers, oil-derived pesticides, and hydrocarbon-fueled irrigation, and that many crops have become so genetically uniform that a crop failure in any one country could potentially have global repercussions.[24]

In May 2008, the price of grain was pushed up severely by the increased cultivation of biofuels, the increase of world oil prices to over $140 per barrel ($880/m3),[25] global population growth,[26] the effects of climate change,[27] the loss of agricultural land to residential and industrial development,[28][29] and growing consumer demand in the population centres of China and India.[30][31] Food riots subsequently occurred in some countries.[32][33] However, oil prices then fell sharply. Resource demands are expected to ease as population growth declines, but it is unclear whether mass food wastage and rising living standards in developing countries will once again create resource shortages.[34][35]

David Pimentel, professor of ecology and agriculture at Cornell University, estimates that the sustainable agricultural carrying capacity for the United States is about 200 million people; its population as of 2015 is over 300 million.[36] In 2009, the UK government's chief scientific advisor, Professor John Beddington, warned that growing populations, falling energy reserves and food shortages would create a "perfect storm" of shortages of food, water, and energy by 2030.[20][37] According to a 2009 report by the United Nations Food and Agriculture Organization (FAO), the world will have to produce 70% more food by 2050 to feed a projected extra 2.3 billion people.[38]

The observed figures for 2007 showed an actual increase in absolute numbers of undernourished people in the world, with 923 million undernourished in 2007, versus 832 million in 1995.[39] The 2009 FAO estimates showed an even more dramatic increase, to 1.02 billion.[40]

Human impact on the environment[edit]

Illegal slash-and-burn agriculture in Madagascar, 2010

A number of scientists have argued that the looming human impact on the environment and accompanying increase in resource consumption threatens the world's ecosystem and the survival of human civilization.[41][42][43][17] Scientists contend that continued human population growth and overconsumption, particularly by the wealthy, are the primary drivers of mass species extinction[44][45][46] and some suggesting human overpopulation as a driver.[47]

Human population planning[edit]

A government sign in China: "For a prosperous, powerful nation and a happy family, please practice family planning."

Human population planning is the practice of intervening to alter the rate of population growth. Historically, human population control has been implemented by limiting a region's birth rate, by voluntary contraception or by government mandate. It has been undertaken as a response to factors including high or increasing levels of poverty, environmental concerns, and religious reasons. The use of abortion in some population control strategies has caused controversy,[48] with religious organizations such as the Roman Catholic Church explicitly opposing any intervention in the human reproductive process.[49]

The University of Nebraska publication Green Illusions argues that population control to alleviate environmental pressures need not be coercive. It states that "Women who are educated, economically engaged, and in control of their own bodies can enjoy the freedom of bearing children at their own pace, which happens to be a rate that is appropriate for the aggregate ecological endowment of our planet."[50] The book Fatal Misconception by Matthew Connelly similarly points to the importance of supporting the rights of women in bringing population levels down over time.[51] Paul Ehrlich also advocates making "modern contraception and back-up abortion available to all and give women full equal rights, pay and opportunities with men," noting that it could possibly "lead to a low enough total fertility rate that the needed shrinkage of population would follow. [But] it will take a very long time to humanely reduce total population to a size that is sustainable." Ehrlich places the optimum global population size at 1.5 to 2 billion people.[52]

Other academicians and public figures have pointed to the role of agriculture and agricultural productivity of increasing human carrying capacity, which results in population overshoot, as with any other species when their food supply experiences an increase, which in turn results in resource depletion and mass poverty and starvation in the case of humans.[53][54][55][56]

See also[edit]

References[edit]

  1. ^ Global Footprint Network. (2010). The Ecological Footprint Atlas 2010
  2. ^ Schreef, Nathan Surendran (2014-12-01). "Humans in ecological overshoot: Collapse now to avoid a larger catastrophe". The Seneca Effect. Retrieved 2017-05-16.
  3. ^ "Media Backgrounder; Earth Overshoot Day; 6. Population and Consumption". Earth Overshoot Day. Global Footprint Network. 2021. Retrieved 22 January 2021.
  4. ^ Schmitz, Oswald J. (2013). Ecology and Ecosystem Conservation. Island Press. p. 51. ISBN 978-1597265980. Retrieved 2 August 2016.
  5. ^ Howes, Michael (2011). "Development and Ethical Sustainability". In Newman, Julie (ed.). Green Ethics and Philosophy: An A-to-Z Guide Volume 8 of The SAGE Reference Series on Green Society: Toward a Sustainable Future-Series Editor: Paul Robbins. SAGE Publications. p. 114. ISBN 978-1452266220. Retrieved 2 August 2016.
  6. ^ Debora MacKenzie (10 October 2011). "Low-key projects keep Horn of Africa famine at bay". NewScientist. Reed Business Information. Retrieved 11 October 2011.
  7. ^ Meadows, Donella; Jørgen Randers; Dennis Meadows (2004). Limits to growth: The 30-year update. White River Junction, VT: Chelsea Green Publishing Company. p. 337. ISBN 1-931498-51-2.
  8. ^ Meadows, Donella H; Meadows, Dennis L; Randers, Jørgen; Behrens III, William W (1972). The Limits to Growth; A Report for the Club of Rome's Project on the Predicament of Mankind. New York: Universe Books. ISBN 0876631650. Retrieved 26 November 2017.
  9. ^ Sharpe, M.E. (2015). Economic Abundance: An Introduction. M.E. Sharpe. p. 67. ISBN 978-0765628084. Retrieved 2 August 2016.
  10. ^ William R. Catton, Jr. (1980). Overshoot: The Ecological Basis of Revolutionary Change. University of Illinois Press. ISBN 9780252008184.
  11. ^ Ryerson, W. F. (2010), "Population, The Multiplier of Everything Else", in McKibben, D. (ed.), The Post Carbon Reader: Managing the 21st Century Sustainability Crisis, Watershed Media, ISBN 978-0-9709500-6-2
  12. ^ Brown, L. R. (2011). World on the Edge. Earth Policy Institute. Norton. ISBN 978-0-393-08029-2.
  13. ^ Mathis Wackernagel, Niels B. Schulz, Diana Deumling, Alejandro Callejas Linares, Martin Jenkins, Valerie Kapos, Chad Monfreda, Jonathan Loh, Norman Myers Richard Norgaard and Jørgen Rander (May 16, 2002). Tracking the ecological overshoot of the human economy. Retrieved 2 August 2016.
  14. ^ Wackernagel, Mathis; Lin, David; Evans, Mikel; Hanscom, Laurel; Raven, Peter (2019). "Defying the Footprint Oracle: Implications of Country Resource Trends". Sustainability. 11 (7): 2164. doi:10.3390/su11072164.
  15. ^ "New index highlights most overpopulated countries". populationmatters.org. Optimum Population Trust. 10 April 2012. Retrieved 10 April 2012.
  16. ^ "Loop | Publication Impact | Underestimating the Challenges of Avoiding a Ghastly Future".
  17. ^ a b c Bradshaw, Corey J. A.; Ehrlich, Paul R.; Beattie, Andrew; Ceballos, Gerardo; Crist, Eileen; Diamond, Joan; Dirzo, Rodolfo; Ehrlich, Anne H.; Harte, John; Harte, Mary Ellen; Pyke, Graham; Raven, Peter H.; Ripple, William J.; Saltré, Frédérik; Turnbull, Christine; Wackernagel, Mathis; Blumstein, Daniel T. (2021). "Underestimating the Challenges of Avoiding a Ghastly Future". Frontiers in Conservation Science. 1. doi:10.3389/fcosc.2020.615419.
  18. ^ Lin, D; Hanscom, L; Murthy, A; Galli, A; Evans, M; Neill, E; Mancini, MS; Martindill, J; Medouar, F-Z; Huang, S; Wackernagel, M. (2018). "Ecological Footprint Accounting for Countries: Updates and Results of the National Footprint Accounts, 2012–2018". Resources. 7(3): 58. https://doi.org/10.3390/resources7030058
  19. ^ Joseph A. Tainter (2006). "Archaeology of Overshoot and Collapse". Annual Review of Anthropology. 35: 59–74. doi:10.1146/annurev.anthro.35.081705.123136.
  20. ^ a b "World faces 'perfect storm' of problems by 2030, chief scientist to warn". The Guardian. 18 March 2009. Archived from the original on 14 November 2016. Retrieved 18 February 2013.
  21. ^ Jowit, Juliette (23 October 2011). "Paul Ehrlich, a prophet of global population doom who is gloomier than ever". The Guardian. London. Archived from the original on 1 October 2013. Retrieved 22 July 2013.
  22. ^ Kindall, Henery W & Pimentel, David (May 1994). "Constraints on the Expansion of the Global Food Supply". Ambio. 23 (3). Archived from the original on 11 October 2018. Retrieved 10 August 2009.
  23. ^ "The limits of a Green Revolution?". BBC News. 29 March 2007. Archived from the original on 28 July 2011. Retrieved 18 February 2013.
  24. ^ "Host Plant Resistance and Conservation of Genetic Diversity". Radcliffe's IPM World Textbook. University of Minnesota. March 2013. Archived from the original on 3 November 2013. Retrieved 20 July 2013.
  25. ^ "The global grain bubble". The Christian Science Monitor. 18 January 2008. Archived from the original on 30 November 2009. Retrieved 18 February 2013.
  26. ^ James Randerson, science correspondent (7 March 2008). "Food crisis will take hold before climate change, warns chief scientist". The Guardian. London. Archived from the original on 2 September 2013. Retrieved 18 February 2013.
  27. ^ John Vidal, environment editor (3 November 2007). "Global food crisis looms as climate change and fuel shortages bite". The Guardian. London. Archived from the original on 30 September 2013. Retrieved 18 February 2013. {{cite news}}: |author= has generic name (help)
  28. ^ Walsoft (22 February 2008). "Experts: Global Food Shortages Could 'Continue for Decades'". Marketoracle.co.uk. Archived from the original on 21 February 2013. Retrieved 18 February 2013.
  29. ^ Moya K. Mason. "Has Urbanization Caused a Loss to Agricultural Land?". Moyak.com. Archived from the original on 24 September 2013. Retrieved 9 July 2013.
  30. ^ Walt, Vivienne (27 February 2008). "The World's Growing Food-Price Crisis". Time. Archived from the original on 29 November 2011. Retrieved 18 February 2013.
  31. ^ "The cost of food: Facts and figures" Archived 20 January 2009 at the Wayback Machine. BBC. 16 October 2008. Retrieved 18 February 2013.
  32. ^ Julian Borger (26 February 2008). "Feed the world? We are fighting a losing battle, UN admits". The Guardian. London. Archived from the original on 25 December 2016. Retrieved 18 February 2013.
  33. ^ Buchanan, Emily (22 April 2008). "Assessing the global food crisis". BBC News. Archived from the original on 15 January 2009. Retrieved 6 April 2010.
  34. ^ "Half of all food 'wasted' report claims". BBC. 10 January 2013. Archived from the original on 10 January 2013. Retrieved 10 January 2013.
  35. ^ "Oil shock could push world food prices higher". CNN Money. 3 March 2011. Archived from the original on 9 March 2013. Retrieved 18 February 2013.
  36. ^ P. Crabbè (2000). Implementing ecological integrity: restoring regional and global environmental and human health. North Atlantic Treaty Organization Scientific Affairs Division/Springer. p. 411. ISBN 978-0-7923-6351-4.
  37. ^ "Global crisis 'to strike by 2030". BBC News. 19 March 2009. Archived from the original on 15 November 2016. Retrieved 18 February 2013.
  38. ^ "Global food production will have to increase 70% for additional 2.3 billion people by 2050". Finfacts.com. 24 September 2009. Archived from the original on 10 March 2016. Retrieved 18 February 2013.
  39. ^ "The State of Food Insecurity in the World, 2008: High food prices and food security – threats and opportunities". UN Food and Agriculture Organization – Economic and Social Development Department. 2008. p. 2. Archived from the original on 13 June 2018. Retrieved 8 December 2012.
  40. ^ "One sixth of humanity undernourished – more than ever before". Food and Agriculture Organization of the United Nations. 2009. Archived from the original on 17 November 2012. Retrieved 8 December 2012.
  41. ^ "Ecological Debt Day". Archived from the original on December 17, 2008. Retrieved February 18, 2013.
  42. ^ "Planetary Boundaries: Specials". Nature. 23 September 2009. Archived from the original on 12 February 2013. Retrieved 18 February 2013.
  43. ^ Bologna, M.; Aquino, G. (2020). "Deforestation and world population sustainability: a quantitative analysis". Scientific Reports. 10 (7631): 7631. arXiv:2006.12202. Bibcode:2020NatSR..10.7631B. doi:10.1038/s41598-020-63657-6. PMC 7203172. PMID 32376879.
  44. ^ Pimm, S.L.; Jenkins, C.N.; Abell, R.; Brooks, T.M.; Gittleman, J.L.; Joppa, L.N.; Raven, P. H.; Roberts, C. M.; Sexton, J. O. (30 May 2014). "The biodiversity of species and their rates of extinction, distribution, and protection" (PDF). Science. 344 (6187): 1246752. doi:10.1126/science.1246752. PMID 24876501. S2CID 206552746. Archived (PDF) from the original on 31 August 2019. Retrieved 15 December 2016. The overarching driver of species extinction is human population growth and increasing per capita consumption.
  45. ^ Ceballos, Gerardo; Ehrlich, Paul R.; Barnosky, Anthony D.; García, Andrés; Pringle, Robert M.; Palmer, Todd M. (2015). "Accelerated modern human–induced species losses: Entering the sixth mass extinction". Science Advances. 1 (5): e1400253. Bibcode:2015SciA....1E0253C. doi:10.1126/sciadv.1400253. PMC 4640606. PMID 26601195.
  46. ^ Sutter, John D. (12 December 2016). "How to stop the sixth mass extinction". CNN. Archived from the original on 12 January 2017. Retrieved 19 December 2016.
  47. ^ Ceballos, Gerardo; Ehrlich, Paul R; Dirzo, Rodolfo (23 May 2017). "Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines". PNAS. 114 (30): E6089–E6096. doi:10.1073/pnas.1704949114. PMC 5544311. PMID 28696295. Much less frequently mentioned are, however, the ultimate drivers of those immediate causes of biotic destruction, namely, human overpopulation and continued population growth, and overconsumption, especially by the rich. These drivers, all of which trace to the fiction that perpetual growth can occur on a finite planet, are themselves increasing rapidly.
  48. ^ Some population control programs, such as China's one-child policy, entail the use of forced late-term abortions, sparking domestic anger and international condemnation: "China one-child policy leads to forced abortions, mothers' deaths". Los Angeles Times. 15 June 2012. Archived from the original on 29 August 2012. Retrieved 29 August 2012.
  49. ^ "Fighting poverty to build peace". Vatican. 1 January 2009. Archived from the original on 11 October 2011. Retrieved 24 October 2011.
  50. ^ Zehner, Ozzie (2012). Green lllusions. Lincoln and London: University of Nebraska. p. 188. Archived from the original on 29 November 2019. Retrieved 10 April 2020.
  51. ^ Connelly, Matthew (2008). Fatal Misconception: The Struggle to Control World Population. ISBN 978-0674029835.
  52. ^ Carrington, Damian (22 March 2018). "Paul Ehrlich: 'Collapse of civilisation is a near certainty within decades'". The Guardian. Retrieved 23 August 2020.
  53. ^ Cite Warren, Stephen G. "Did agriculture cause the population explosion?." Nature 397.6715 (1999): 101.
  54. ^ "Morgan Freeman on the 'Tyranny of Agriculture' and the Doomed Human Race". ecorazzi. 19 February 2014.
  55. ^ Armelagos, George J.; Goodman, Alan H.; Jacobs, Kenneth H. (1 September 1991). "The origins of agriculture: Population growth during a period of declining health". Population and Environment. 13 (1): 9–22. doi:10.1007/BF01256568. ISSN 1573-7810. S2CID 153470610.
  56. ^ "Agriculture and Human Population Growth". CK-12.

Further reading[edit]

External links[edit]

External video
video icon How Earth's Population Exploded -Bloomberg Quicktake