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World3
The World3 model is a system dynamics model for computer simulation of interactions between population, industrial growth, food production and limits in the ecosystems of the earth. It was originally produced and used by a Club of Rome study that produced the model and the book '' The Limits to Growth'' (1972). The creators of the model were Dennis Meadows, project manager, and a team of 16 researchers. The model was documented in the book ''Dynamics of Growth in a Finite World''. It added new features to Jay W. Forrester's World2 model. Since World3 was originally created, it has had minor tweaks to get to the World3/91 model used in the book '' Beyond the Limits'', later improved to get the World3/2000 model distributed by the Institute for Policy and Social Science Research and finally the World3/2004 model used in the book ''Limits to Growth: the 30 year update''. World3 is one of several global models that have been generated throughout the world (Mesarovic/Pestel Model, Bar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World3 Nonrenewable Resource Sector
The World3 nonrenewable resource Business sector, sector is the portion of the World3 model that simulates nonrenewable resources. The World3 model is a simulation of human interaction with the environment that was designed in the 1970s to predict population and living standards over the next 100 years. The nonrenewable resource sector of the World3 model was used to calculate the cost and usage rates of nonrenewable resources. In the context of this model, nonrenewable resources are resources that there are a finite amount of on Earth, such as iron ore, oil, or coal. This model assumes that regardless of how much money is spent on extraction, there is a finite limit for the amount of Non-renewable resource, nonrenewable resources that can be extracted. Overview The model combines all possible nonrenewable resources into one aggregate Variable (computer science), variable, . This combines both energy resources and non-energy resources. Examples of nonrenewable energy resourc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Limits To Growth
''The Limits to Growth'' (''LTG'') is a 1972 report that discussed the possibility of exponential economic and population growth with finite supply of resources, studied by computer simulation. The study used the World3 computer model to simulate the consequence of interactions between the earth and human systems. The model was based on the work of Jay Forrester of MIT, as described in his book ''World Dynamics''. Commissioned by the Club of Rome, the findings of the study were first presented at international gatherings in Moscow and Rio de Janeiro in the summer of 1971. The report's authors are Donella H. Meadows, Dennis L. Meadows, Jørgen Randers, and William W. Behrens III, representing a team of 17 researchers. The report concludes that, without substantial changes in resource consumption, "the most probable result will be a rather sudden and uncontrollable decline in both population and industrial capacity". Although its methods and premises were heavily challenged on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Limits To Growth
''The Limits to Growth'' (''LTG'') is a 1972 report that discussed the possibility of exponential economic and population growth with finite supply of resources, studied by computer simulation. The study used the World3 computer model to simulate the consequence of interactions between the earth and human systems. The model was based on the work of Jay Forrester of MIT, as described in his book ''World Dynamics''. Commissioned by the Club of Rome, the findings of the study were first presented at international gatherings in Moscow and Rio de Janeiro in the summer of 1971. The report's authors are Donella H. Meadows, Dennis L. Meadows, Jørgen Randers, and William W. Behrens III, representing a team of 17 researchers. The report concludes that, without substantial changes in resource consumption, "the most probable result will be a rather sudden and uncontrollable decline in both population and industrial capacity". Although its methods and premises were heavily challenged on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sustainability And Systemic Change Resistance
The environmental sustainability problem has proven difficult to solve. The modern environmental movement has attempted to solve the problem in a large variety of ways. But little progress has been made, as shown by severe ecological footprint overshoot and lack of sufficient progress on the climate change problem. Something within the human system is preventing change to a sustainable mode of behavior. That system trait is systemic change resistance. Change resistance is also known as organizational resistance, barriers to change, or policy resistance. Overview of resistance to solving the sustainability problem While environmentalism had long been a minor force in political change, the movement strengthened significantly in the 1970s with the first Earth Day in 1970, in which over 20 million people participated, with publication of ''The Limits to Growth'' in 1972, and with the first United Nations Conference on the Human Environment in Stockholm in 1972. Early expectations th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Simulation
Computer simulation is the process of mathematical modelling, performed on a computer, which is designed to predict the behaviour of, or the outcome of, a real-world or physical system. The reliability of some mathematical models can be determined by comparing their results to the real-world outcomes they aim to predict. Computer simulations have become a useful tool for the mathematical modeling of many natural systems in physics (computational physics), astrophysics, climatology, chemistry, biology and manufacturing, as well as human systems in economics, psychology, social science, health care and engineering. Simulation of a system is represented as the running of the system's model. It can be used to explore and gain new insights into new technology and to estimate the performance of systems too complex for analytical solutions. Computer simulations are realized by running computer programs that can be either small, running almost instantly on small devices, or large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
System Dynamics
System dynamics (SD) is an approach to understanding the nonlinear behaviour of complex systems over time using stocks, flows, internal feedback loops, table functions and time delays. Overview System dynamics is a methodology and mathematical modeling technique to frame, understand, and discuss complex issues and problems. Originally developed in the 1950s to help corporate managers improve their understanding of industrial processes, SD is currently being used throughout the public and private sector for policy analysis and design. Convenient graphical user interface (GUI) system dynamics software developed into user friendly versions by the 1990s and have been applied to diverse systems. SD models solve the problem of simultaneity (mutual causation) by updating all variables in small time increments with positive and negative feedbacks and time delays structuring the interactions and control. The best known SD model is probably the 1972 ''The Limits to Growth''. This model f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dennis Meadows
Dennis Lynn Meadows (born June 7, 1942) is an American scientist and Emeritus Professor of Systems Management, and former director of the Institute for Policy and Social Science Research at the University of New Hampshire. He is President of the Laboratory for Interactive Learning and widely known as a coauthor of ''The Limits to Growth''. Biography Dennis Meadows was born on June 7, 1942. He received a BA from Carleton College, a PhD in Management from the MIT Sloan School of Management, and holds four honorary doctorates. He started working at the faculty of the Massachusetts Institute of Technology in the late 1960s. From 1970 to 1972 at MIT he was director of the "Club of Rome Project on the Predicament of Mankind".Dennis L. Meadows (1977). ''Alternatives to growth-I: a search for sustainable futures : papers adapted''. p.309. Further on Meadows has been a tenured professor in faculties of management, engineering, and social sciences. For many years he was the director ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donella Meadows
Donella Hager "Dana" Meadows (March 13, 1941 – February 20, 2001) was an American environmental scientist, educator, and writer. She is best known as lead author of the books ''The Limits to Growth'' and '' Thinking In Systems: A Primer''. Early life and education Born in Elgin, Illinois, Meadows was educated in science, receiving a B.A. in chemistry from Carleton College in 1963 and a PhD in biophysics from Harvard in 1968. After a yearlong trip from England to Sri Lanka and back, she became a research fellow at the Massachusetts Institute of Technology as a member of a team in the department created by Jay Forrester, the inventor of system dynamics as well as the principle of magnetic data storage for computers. Career Meadows taught at Dartmouth College for 29 years, beginning in 1972.Meadows, Donella H. 2008, ''Thinking in Systems: A Primer'', Chelsea Green Publishing, Vermont, p. 213 (About the Author), . Meadows was honored both as a Pew Scholar in Conservation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beyond The Limits
''Beyond the Limits'' is a 1992 book continuing the modeling of the consequences of a rapidly growing global population that was started in the 1972 report ''Limits to Growth''. Donella Meadows, Dennis Meadows, and Jørgen Randers are the authors and all were involved in the original Club of Rome study as well. ''Beyond the Limits'' (Chelsea Green Publishing Company) and Earthscan addressed many of the criticisms of the ''Limits to Growth'' book, but still has caused controversy and mixed reactions. Reviews :"Society has gone into overshoot, … a state of being beyond limits without knowing it. These limits are more like speed limits than barriers at the end of the road: the rate at which renewable resources can renew themselves, the rate at which we can change from nonrenewable resources to renewable ones, and the rate at which nature can recycle our pollution. … are overshooting such crucial resources as food and water while overwhelming nature with pollutants like thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of Industrial Ecology
The ''Journal of Industrial Ecology'' is a bimonthly peer-reviewed academic journal covering industrial ecology. It is published by Wiley-Blackwell on behalf of the Yale School of the Environment and is an official journal of the International Society for Industrial Ecology. The editor-in-chief is Reid Lifset. According to the ''Journal Citation Reports'', the journal had an impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as i ... of 6.946 in 2020. Abstracting and indexing The journal is abstracted and indexed in: References External links * {{Official website, http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1530-9290 Environmental science journals Wiley-Blackwell academic journals Yale University academic journals Bimonthly journals Publications establi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vice
A vice is a practice, behaviour, or habit generally considered immoral, sinful, criminal, rude, taboo, depraved, degrading, deviant or perverted in the associated society. In more minor usage, vice can refer to a fault, a negative character trait, a defect, an infirmity, or a bad or unhealthy habit. Vices are usually associated with a transgression in a person's character or temperament rather than their morality. Synonyms for vice include fault, sin, depravity, iniquity, wickedness, and corruption. The antonym of vice is virtue. Etymology The modern English term that best captures its original meaning is the word ''vicious'', which means "full of vice". In this sense, the word ''vice'' comes from the Latin word '' vitium'', meaning "failing or defect". Law enforcement Depending on the country or jurisdiction, vice crimes may or may not be treated as a separate category in the criminal codes. Even in jurisdictions where vice is not explicitly delineated in the legal code, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Model (abstract)
A conceptual model is a representation of a system. It consists of concepts used to help people know, understand, or simulate a subject the model represents. In contrast, physical models are physical object such as a toy model that may be assembled and made to work like the object it represents. The term may refer to models that are formed after a conceptualization or generalization process. Conceptual models are often abstractions of things in the real world, whether physical or social. Semantic studies are relevant to various stages of concept formation. Semantics is basically about concepts, the meaning that thinking beings give to various elements of their experience. Overview Models of concepts and models that are conceptual The term ''conceptual model'' is normal. It could mean "a model of concept" or it could mean "a model that is conceptual." A distinction can be made between ''what models are'' and ''what models are made of''. With the exception of iconic models, su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
