The sun drops roughly a kilowatt/square meter of energy onto the earth. A toaster uses roughly a kilowatt. The sun delivers a huge quantity of energy compared

The sun drops roughly a kilowatt/square meter of energy onto the earth. A toaster uses roughly a kilowatt. The sun delivers a huge quantity of energy compared with that used by humans. http://en.wikipedia.org/wiki/Earths_energy_budget http://en.wikipedia.org/wiki/Earths_energy_budget