Minimal World Model
Energy input = 500 Quadrillion BTU/year, the rate in 2013
World GDP = 87,000 billion US dollars in 2013
Energy efficiency of GDP = 174 $billions/quad in 2013 the highest to date is about 200
Desired Mean GDP/capita = 20,000 $/person/year
Pop Energy World GDP Efficiency
Millions Quad $billions $billions/quad Notes: 1. It will be many years before we can produce
3,000 500 60,000 120       500 quadrillion Btu without fossil fuels.
4,000 500 80,000 160        http://www.eia.gov/totalenergy/data/monthly/pdf/sec10.pdf
5,000 500 100,000 200 2. However, birth rates are decreasing:   UN Birth rates.htm
6,000 500 120,000 240 3. It is feasible to maintain about 3-4 billion humans
7,000 500 140,000 280        at $20,000 per person per year without fossil fuels.
8,000 500 160,000 320 Heaven.htm
9,000 500 180,000 360 Modelout.htm
World_Energy_Plan.htm