Quote:
Originally Posted by kevman
It's not entirely for free. The sun's energy heats the earth. The more energy we use the less energy reaches the earths surface and in turn heats it. I could just see it know...Global Cooling... 
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Yeah but if we use that energy where does it go? Unless we're trapping it in kinetic energy by launching stuff off the planet or storing it forever in some chemical bonds, it will eventually become heat. Burn the hydrogen, you get heat. Use it to move a car, all that energy becomes heat. Use it to heat a home.. you get the idea