Quote Originally Posted by douglas View Post
Most forms of energy production on Earth are actually derived from the sun in some way. The exceptions are nuclear power, geothermal, and tidal. Fossil fuels, hydro power, wind, and (of course) solar all wouldn't work without the sun constantly dumping huge amounts of energy into the planetary ecosystem.
Tidal as well, actually. Quite a bit of the tides are due to the sun.