Figure 2. The sum of red and blue areas on chart represent world energy consumption growth by 10-year periods. Blue areas represent population growth percentages during these 10-year periods. The red area is determined by subtraction. It represents the amount of energy consumption growth that is “left over” for growth in standard of living. Chart by Gail Tverberg using data from several sources, in energy data from Vaclav Smil’s estimates from Energy Transitions: History, Requirements and Prospects, together with BP Statistical Data for 1965 and subsequent.