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Carrying capacity is not a fixed number. Estimates put Earth's carrying capacity at anywhere between 2 billion and 40 billion people.

en.wikipedia.org/wiki/Carrying_capacity

The carrying capacity of a biological species in an environment is the maximum population size ... The application of the concept of carrying capacity for the human population has been criticized for not successfully ... the use of fossil fuels has been alleged to artificially increase the carrying capacity of the world by the use of ...

worldpopulationhistory.org/carrying-capacity

In other words, there is a carrying capacity for human life on our planet. Carrying capacity is the maximum number of a species an environment can support ...

www.livescience.com/16493-people-planet-earth-support.html

Oct 11, 2011 ... Humans' unquenchable urge to reproduce, Malthus argued, would ... Many scientists think Earth has a maximum carrying capacity of 9 billion ...

www.realclearscience.com/blog/2012/04/human-carrying-capacity.html

Apr 12, 2012 ... Last year, the world population reached 7000000000. At the time, the media and blogosphere briefly erupted in a war of editorials arguing ...

www.econ.yale.edu/~nordhaus/homepage/documents/CohenScience_carrying_cap.pdf

human population growth and human carrying capacity can account for ... 15% of people in the world's riphest coun- ... Today, the world has about 5.7 billion.

science.howstuffworks.com/environmental/green-science/earth-carrying-capacity1.htm

Learn why estimates of the Earth's carrying capacity vary so widely and find out what the ... If humans were still in the hunter-gatherer mode, Earth would have reached its ... Because people in different parts of the world are consuming different ...

www.quora.com/What-is-Earths-human-carrying-capacity

Carrying capacity for any organism depends upon a number of different factors and tends to .... The world, including human economic and political interaction is much more complex than that simplistic calculation. No scientist should have the  ...

na.unep.net/geas/archive/pdfs/GEAS_Jun_12_Carrying_Capacity.pdf

Jun 8, 2012 ... of the human population but now some people have experienced a tripling .... Figure 2: Estimates of Earth's carrying capacity vary dramatically as this survey of 65 different ... to revisit the Limits to Growth and “world modeling”.

www.sustainablescale.org/ConceptualFramework/UnderstandingScale/MeasuringScale/CarryingCapacity.aspx

Biologists define carrying capacity as the maximum population of a given species that can survive ... The concept of carrying capacity was applied to human populations in the 1960's. ... Environmental Science: The Way the World Works.