File:Olduvai per capita-en.png

Summary
Graphic of year 2000 which shows the energy per capita production following Duncan from 1920 to 2000. Each color represents a stage of the industrial civilisation, from 1930 to 2030. Blue:Growthing stage (1930-1979). Green (1979) and Yellow (2000-2012): Stagnation. Red:Decline, with a drastic reduction of the energy production from 2012.