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The Limits to Growth (LTG) is a 1972 report [2] that discussed the possibility of exponential economic and population growth with finite supply of resources, studied by computer simulation. [3] The study used the World3 computer model to simulate the consequence of interactions between the Earth and human systems.
He had previously read two influential books about population concerns, The Limits to Growth and A Blueprint for Survival, while visiting Europe in 1980. Along with several associates, Song determined that the ideal population of China was 700 million, and that a universal one-child policy for all would be required to meet that goal. [ 42 ]
Chengdu [a] is the capital city of the Chinese province of Sichuan. With a population of 20,937,757 at the 2020 census, [5] it is the fourth most populous city in China, and it is the only city with a population of over 20 million apart from direct-administered municipalities. It is traditionally the hub of Western China. Chengdu is in central ...
Demographic economics or population economics is the application of economic analysis to demography, the study of human populations, including size, growth, density, distribution, and vital statistics.
The population of the More Developed regions is slated to remain mostly unchanged, at 1.2-1.3 billion for the remainder of the 21st century. All population growth comes from the Less Developed regions. [6] [7] The table below breaks out the UN's future population growth predictions by region [6] [7]
Among them, the total permanent population of Chongqing, Shanghai, Beijing and Chengdu is above 20 million. [7] Shanghai is China's most populous urban area, [8] [9] while Chongqing is its largest city proper, the only city in China with the largest permanent population of over 30 million. [10]
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P 0 = P(0) is the initial population size, r = the population growth rate, which Ronald Fisher called the Malthusian parameter of population growth in The Genetical Theory of Natural Selection, [2] and Alfred J. Lotka called the intrinsic rate of increase, [3] [4] t = time. The model can also be written in the form of a differential equation: