They are guessing much less than those who simply extrapolate exponential growth. The population plateau is based on the development trends observed in develop

They are guessing much less than those who simply extrapolate exponential growth. The population plateau is based on the development trends observed in developed and developing countries. As standard of living increases, with improved life expectancy and education, population growth slows. Many developed countries are below the replacement rate, and any population growth is as a result of immigration from less-developed countries.