This and related pages describe and discuss Version 4 of the Populationconsumption model. Version 4 introduces a new definition of "happiness" as the fraction of "inhabited environments" that are used by the world population. This ties population growth to consumption of ecological resources through the relationship between ecological footprint and happiness. Using historical trends, future trajectories of population and consumption are projected and their implications explored. The model is an empiricallyderived theoretical construct that simplistically represents the dynamics involved in the most essential aspects of humanity's future: those affecting our survival. Like any hypothesis, it is subject to test. 

Basic equations:
where:


Additional information


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