The Limits to Growth
The Limits to Growth first edition cover.
|Author||Donella H. Meadows
Dennis L. Meadows
William W. Behrens III
|Followed by||The First Global Revolution|
The Limits to Growth is a 1972 book about the computer simulation of exponential economic and population growth with finite resource supplies. Funded by the Volkswagen Foundation and commissioned by the Club of Rome it was first presented at the St. Gallen Symposium. Its authors were Donella H. Meadows, Dennis L. Meadows, Jørgen Randers, and William W. Behrens III. The book used the World3 model to simulate the consequence of interactions between the Earth's and human systems.
Five variables were examined in the original model. These variables are: world population, industrialization, pollution, food production, and resource depletion. The authors intended to explore the possibility of a sustainable feedback pattern that would be achieved by altering growth trends among the five variables under three scenarios. They noted that their projections for the values of the variables in each scenario were predictions "only in the most limited sense of the word," and were only indications of the system's behavioral tendencies. Two of the scenarios saw "overshoot and collapse" of the global system by the mid to latter part of the 21st century, while a third scenario resulted in a "stabilized world."
The most recent updated version was published on June 1, 2004 by Chelsea Green Publishing Company and Earthscan under the name Limits to Growth: The 30-Year Update. Donella H. Meadows, Jørgen Randers, and Dennis Meadows have updated and expanded the original version.
The book continues to generate fervent debate and has been the subject of several subsequent publications.
The purpose of The Limits to Growth was not to make specific predictions, but to explore how exponential growth interacts with finite resources. Because the size of resources is not known, only the general behavior can be explored. The authors state in a subsection titled The Purpose of the World Model:
In this first simple world model, we are interested only in the broad behavior modes of the population-capital system. By behavior modes we mean the tendencies of the variables in the system (population or pollution, for example) to change as time progresses. A variable may increase, decrease, remain constant, oscillate, or combine several of these characteristic modes. For example, a population growing in a limited environment can approach the ultimate carrying capacity of that environment in several possible ways. It can adjust smoothly to an equilibrium below the environmental limit by means of a gradual decrease in growth rate, as shown below. It can overshoot the limit and then die back again in either a smooth or an oscillatory way, also as shown below. Or it can overshoot the limit and in the process decrease the ultimate carrying capacity by consuming some necessary nonrenewable resource, as diagrammed below. This behavior has been noted in many natural systems. For instance, deer or goats, when natural enemies are absent, often overgraze their range and cause erosion or destruction of the vegetation.
A major purpose in constructing the world model has been to determine which, if any, of these behavior modes will be most characteristic of the world system as it reaches the limits to growth. This process of determining behavior modes is "prediction" only in the most limited sense of the word. The output graphs reproduced later in this book show values for world population, capital, and other variables on a time scale that begins in the year 1900 and continues until 2100. These graphs are not exact predictions of the values of the variables at any particular year in the future. They are indications of the system's behavioral tendencies only.
The difference between the various degrees of "prediction" might be best illustrated by a simple example. If you throw a ball straight up into the air, you can predict with certainty what its general behavior will be. It will rise with decreasing velocity, then reverse direction and fall down with increasing velocity until it hits the ground. You know that it will not continue rising forever, nor begin to orbit the earth, nor loop three times before landing. It is this sort of elemental understanding of behavior modes that we are seeking with the present world model. If one wanted to predict exactly how high a thrown ball would rise or exactly where and when it would hit the ground, it would be necessary to make a detailed calculation based on precise information about the ball, the altitude, the wind, and the force of the initial throw. Similarly, if we wanted to predict the size of the earth's population in 1993 within a few percent, we would need a very much more complicated model than the one described here. We would also need information about the world system more precise and comprehensive than is currently available.
Exponential reserve index
One key idea within The Limits to Growth is the notion that if the rate of resource use is increasing, the amount of reserves cannot be calculated by simply taking the current known reserves and dividing by the current yearly usage, as is typically done to obtain a static index. For example, in 1972, the amount of chromium reserves was 775 million metric tons, of which 1.85 million metric tons were mined annually (see exponential growth). The static index is 775/1.85=418 years, but the rate of chromium consumption was growing at 2.6% annually (Limits to Growth, pp 54–71). If instead of assuming a constant rate of usage, the assumption of a constant rate of growth of 2.6% annually is made, the resource will instead last
(note that the book rounded off numbers).
In general, the formula for calculating the amount of time left for a resource with constant consumption growth is:
- y = years left;
- r = 0.026, the continuous compounding growth rate (2.6%).
- s = R/C or static reserve.
- R = reserve;
- C = (annual) consumption.
The authors list a number of similar exponential indices comparing current reserves to current reserves multiplied by a factor of five:
Years Resource Consumption growth rate, annual Static index Exponential index 5 times reserves exponential index Chromium 2.6% 420 95 154 Gold 4.1% 11 9 29 Iron 1.8% 240 93 173 Petroleum 3.9% 31 20 50
The static reserve numbers assume that the usage is constant, and the exponential reserve assumes that the growth rate is constant.
The exponential index has been interpreted as a prediction of the number of years until the world would "run out" of various resources, both by environmentalist groups calling for greater conservation and restrictions on use, and by skeptics criticizing the index when supplies failed to run out. What The Limits to Growth actually has is the above table, which has the current reserves (that is no new sources of oil are found) for oil running out in 1992 assuming constant exponential growth. In Limits to Growth: The Thirty Year Update there are several pages explaining that new resources are found over time and that the current reserves therefore change but that ultimately resources are finite. (Earlier editions did explain this as well, but not in as much detail.) The standard model includes a resource base of double that of what they have calculated, but the book includes model runs where the assumed resources are infinite, but those model runs still result in overshoot and collapse from other factors.
Many books about humanity’s uncertain future have appeared regularly over the years. Precursors to Limits to Growth included Thomas Malthus's An Essay on the Principle of Population (1798), Harrison Brown’s The Challenge of Man’s Future (1956), Rachel Carson’s Silent Spring (1962) and Paul R. Ehrlich’s The Population Bomb (1968). Some of the notable books published after 1972 include the State of the World reports issued by the Worldwatch Institute (produced annually since 1984); the influential Our Common Future, published by the UN’s World Commission on Environment and Development (1987); Earth in the Balance, written by then-US senator Al Gore (1992); and Earth Odyssey (ISBN 978-0767900591) by journalist Mark Hertsgaard (1999).
After publication some economists, scientists and political figures criticized the Limits to Growth. They attacked the methodology, the computer, the conclusions, the rhetoric and the people behind the project. Yale economist Henry C. Wallich agreed that growth could not continue indefinitely, but that a natural end to growth was preferable to intervention. Wallich stated that technology could solve all the problems the Meadows were concerned about, but only if growth continued apace. By stopping growth too soon, Wallich warned, the world would be "consigning billions to permanent poverty".
Robert Solow from MIT, argued that prediction in The Limits to Growth was based on a weak foundation of the data (Newsweek, March 13, 1972, page 103). Allen Kneese and Ronald Riker of Resources for the Future (RFF) stated:
"The authors load their case by letting some things grow exponentially and others not. Population, capital and pollution grow exponentially in all models, but technologies for expanding resources and controlling pollution are permitted to grow, if at all, only in discrete increments."
Critics also argue that the authors of the report claimed to accept that the then-known resources of minerals and energy could, and would, grow in the future, and consumption growth rates could also decline. The theoretical expiry time for each resource would therefore need to be updated as new discoveries, technologies and trends came to light. To overcome this uncertainty, the authors offered an upper value for the expiry time, calculated as if the known resources were multiplied by two. Even in that case, assuming continuation of the average rate of consumption growth, virtually all major minerals and energy resources would expire within 100 years of publication (i.e., by 2070). Even if reserves were two times larger than expected, they state, ongoing growth in the consumption rate would still lead to the relatively rapid exhaustion of those reserves.
The Club of Rome has persisted after The Limits of Growth and has generally provided comprehensive updates to the book on a 5-year basis.
1977: 5 years
An independent retrospective on the public debate over The Limits to Growth concluded in 1978 that optimistic attitudes had won out, causing a general loss of momentum in the environmentalist movement. While summarizing a large number of opposing arguments, the article concluded that "scientific arguments for and against each position ... have, it would seem, played only a small part in the general acceptance of alternative perspectives."
1987: 15 years
1992: 20 years
In 1993, Beyond the Limits was published as a 20-year update on the original material.
2002: 30 years
Limits to Growth: The 30-Year Update was published in 2004.
2007: 35 years
In 2008 Graham Turner at the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia published a paper called "A Comparison of `The Limits to Growth` with Thirty Years of Reality". It examined the past thirty years of reality with the predictions made in 1972 and found that changes in industrial production, food production and pollution are all in line with one of the book's three scenarios so far- that of 'business as usual'. This set of predictions in LtG goes on to forecast economic and societal collapse in the 21st century. In 2010, Peet, Nørgård, and Ragnarsdóttir called the book a "pioneering report". They said that, "its approach remains useful and that its conclusions are still surprisingly valid... unfortunately the report has been largely dismissed by critics as a doomsday prophecy that has not held up to scrutiny."
In a 2009 article published in American Scientist titled "Revisiting the Limits to Growth After Peak Oil," Hall and Day noted that "the values predicted by the limits-to-growth model and actual data for 2008 are very close." These findings are consistent with the above-mentioned 2008 CSIRO study which concluded: "The analysis shows that 30 years of historical data compares favorably with key features… [of the Limits to Growth] ‘standard run’ scenario, which results in collapse of the global system midway through the 21st Century."
In 2008 researcher Peter A. Victor wrote, that even though D.H. Meadows et al. probably underestimated price-mechanism's role in adjusting, their critics have overestimated it. He states that Limits to Growth has had a significant impact on the conception of environmental issues and notes that the models in the book were meant to be taken as predictions "only in the most limited sense of the word" as they wrote.
2012: 40 years
In 2011 Ugo Bardi published a book-length academic study of The Limits to Growth, its methods and historical reception and concluded that "The warnings that we received in 1972 ... are becoming increasingly more worrisome as reality seems to be following closely the curves that the ... scenario had generated." A popular analysis of the accuracy of the report by science writer Richard Heinberg was also published.
In 2012 writing in American Scientist, Brian Hayes stated that the model is "more a polemical tool than a scientific instrument". He went on to say that the graphs generated by the computer program should not, as the authors note, be used as predictions.
In 2014 Graham Turner concluded that "preparing for a collapsing global system could be even more important than trying to avoid collapse."
- Attractiveness principle
- Albert Allen Bartlett
- Donella Meadows' twelve leverage points to intervene in a system
- DYNAMO (programming language)
- Ecological economics
- Economic growth
- Paul R. Ehrlich
- Energy crisis
- Energy development
- Genetic bottleneck
- Hubbert peak theory
- List of countries by fertility rate
- List of environmental books
- Malthusian catastrophe
- Negative Population Growth
- Peak oil
- Planetary boundaries
- Population Connection (formerly Zero Population Growth)
- Richard Rainwater
- Julian L. Simon
- Societal collapse
- Steady state economy
- System dynamics
- The Global 2000 Report to the President
- Zero growth
- The Population Bomb
- The Revenge of Gaia
- MacKenzie, Debora (10 January 2012). "Boom and doom: Revisiting prophecies of collapse". New Scientist. Retrieved 1 April 2012.
- Jens Rehländer, Barbara Riegler: 40 Jahre "Grenzen des Wachstums": Öffentliche Abendveranstaltung mit Dennis Meadows (german), on the side volkswagenstiftung.de, last visited December 2nd, 2012
- The models were run on DYNAMO, a simulation programming language.
- Edwards, Paul N. (2010) A Vast Machine: Computer Models, Climate Data, and the Politics of Global Warming MIT Press ISBN 9780262290715 pg 366-371
- Peter A. Victor (2008). Managing Without Growth, Edward Elgar Publishing, pp. 92-93, ISBN 978-1-84720-078-5
- Graham Turner (2008). "A Comparison of `The Limits to Growth` with Thirty Years of Reality". Page 11. Commonwealth Scientific and Industrial Research Organisation (CSIRO).
- "To Grow or not to Grow", Newsweek, March 13, 1972, pages 102–103
- Donella H. Meadows, Gary. Meadows, Jorgen Randers, and William W. Behrens III. (1972).
The Limits to Growth. New York: Universe Books. ISBN 0-87663-165-0
- Henry C. Wallich, "More on Growth", NewsWeek, March 13, 1972, page 86.
- Meadows, D. (1974). The Limits to Growth, Second Edition Revised, Signet. ISBN 978-0-451-06617-6, pages 99-101
- Limits To Growth, pg 60, Derivation: reverts to
- The Skeptical Environmentalist, p. 121
- Chapter 17: Growth and Productivity-The Long-Run Possibilities
- "Treading lightly". The Economist. 19 September 2002.
- Reason Magazine - Science and Public Policy
- Alan Atkisson (2010). Believing Cassandra: How to be an Optimist in a Pessimist's World, Earthscan, pp. 17-18.
- Kaysen, Carl (1972). "The Computer That Printed out W*O*L*F*". Foreign Affairs 50 (4): 660–668. doi:10.2307/20037939. JSTOR 20037939.
- Solow, Robert M. (1973). "Is the End of the World at Hand?". Challenge 16 (1): 39–50. doi:10.2307/40719094. JSTOR 40719094.
- Alan Atkisson (2010). Believing Cassandra: How to be an Optimist in a Pessimist's World, Earthscan, p. 13.
- Newsweek, March 13, 1972, page 103.
- http://www.ratical.org/corporations/limit2growth.html (Mirror of http://www.clubofrome.org/docs/limits.rtf)
- Sandbach, F. (1 November 1978). "The Rise and Fall of the Limits to Growth Debate". Social Studies of Science 8 (4): 495–520. doi:10.1177/030631277800800404.
- Turner, Graham (June 2008). "A Comparison of `The Limits to Growth` with Thirty Years of Reality". Socio-Economics and the Environment in Discussion (SEED). CSIRO Working Paper Series (Commonwealth Scientific and Industrial Research Organisation (CSIRO)). 2008-09: 52. doi:10.1016/j.gloenvcha.2008.05.001. ISSN 1834-5638. Retrieved July 2014.
- "Prophesy of economic collapse 'coming true'", by Jeff Hecht, New Scientist, 17 November 2008
- Nørgård, Jørgen Stig; John Peet; Kristín Vala Ragnarsdóttir (Feb 2010). "The History of The Limits to Growth". Solutions Journal 1 (2): 59–63. Retrieved July 2014.
- Hall, Charles A. S.; John W. Day (May–June 2009). "Revisiting the Limits to Growth After Peak Oil" (PDF). American Scientist (Sigma Xi, The Scientific Research Society/State University of New York College of Environmental Science and Forestry) 97: 230–237. doi:10.1511/2009.78.230. Retrieved July 2014.
- Ugo Bardi. The Limits to Growth Revisited. Springer 2011 doi:10.1007/978-1-4419-9416-5 p.3
- Heinberg, Richard (2011). The end of growth : adapting to our new economic reality (3rd printing. ed.). Gabriola Island, B.C.: New Society Publishers. ISBN 0865716951.
- Randers, Jorgen. 2052. White River Junction, Vt.: Chelsea Green Pub. ISBN 1603584218.
- Brian Hayes (May–June 2012). "Computation and the Human Predicament - The Limits to Growth and the limits to computer modeling". American Scientist. doi:10.1511/2012.96.186.
- Turner, Graham (August 2014). Rickards, Lauren, ed. "Is Global Collapse Imminent?" (PDF). www.sustainable.unimelb.edu.au (Research Paper No. 4). MSSI Research Papers. Melbourne, Australia: Melbourne Sustainable Society Institute, The University of Melbourne. p. 16. ISBN 978-0-7340-4940-7. Retrieved 2014-10-19.
Regrettably, the alignment of data trends with the LTG dynamics indicates that the early stages of collapse could occur within a decade, or might even be underway. This suggests, from a rational risk-based perspective, that we have squandered the past decades, and that preparing for a collapsing global system could be even more important than trying to avoid collapse.
- ISBN 0-87663-165-0, 1972 first edition (digital version)
- ISBN 0-87663-222-3, 1974 second edition (cloth)
- ISBN 0-87663-918-X, 1974 second edition (paperback)
- ISBN 978-1-931498-58-6, ASIN 1-931498-58-X, 2004 Limits to Growth: The 30-Year Update
|Wikimedia Commons has media related to The Limits to Growth.|
- Limits to Growth Wikiversity Course
- The Limits to Growth 1972 edition, licensed under a Creative Commons Attribution Noncommercial license
- A Resource site for those interested in finding out more about limits to growth
- World3-03 Simulator - runs scenarios discussed in "Limits to Growth: The 30-Year Update
- Revisiting The Limits to Growth: Could the Club of Rome Have Been Correct, After All? (By Matthew R. Simmons)
- 1999 Review by Club of Rome member
- A Synopsis of Limits to Growth: The 30 Year Update
- What was there in the famous "Report to the Club of Rome"?
- Core Statement of the Institute of Growth Research (summary)
Video and audio
- Sound Interview: Dennis Meadows one of the members and authors of the book 09. October 2004 Global Public Media
- Smithsonian: 40 years Limits of Growth on YouTube
- Last Call - documentary examining the predictions of the Limits to Growth book 40 years later