The half-trillion-year fuel supply - it's not solar (was Selling pow

> US estimates of another 200 years of fuel

The world has a half trillion years' worth of fission fuel, at current
nuclear electricity production rates.

The world currently uses 64,615 tonnes of uranium per year.
http://www.world-nuclear.org/info/reactors.html

The world has 40 trillion tonnes of uranium.
http://nuclearinfo.net/Nuclearpower/UraniuamDistribution

Combined with thorium, the world has 200 trillion tonnes of fission
fuel.

200 trillion tonnes fuel / 64,615 = 3.1 billion years of fuel.

The use of breeder reactors would drop the yearly fuel use to 1,000
tonnes/year.

200 trillion tonnes fuel / 1,000 = 200 billion years of fuel.

The thermal efficiency of current reactors averages 34%.

Raise efficiency from 34% to 68% = 400 billion years of fuel.

Raise efficiency from 34% to 85% = 500 billion years of fuel.