Re: Water as fuel

Posted by Mike (WA) on May 24, 2006 at 14:07:15 from (209.213.153.155):

In Reply to: Re: Water as fuel posted by Broomstacker on May 24, 2006 at 11:24:31:

It generally takes more energy to cause a chemical reaction than you get out of that reaction (except nuclear), but the key is to get the extra energy from a "free" and otherwise unused source, like solar, wind, geothermal, etc., so you get a net gain in usable energy. Some detractors of ethanol technology have stated the proposition that it takes more energy to grow the crop than you get out of the ethanol -it turns out they were counting the solar energy to grow the crop, along with the normal energy inputs (fuel, etc.). Incidentally, theories have been advanced that the solution to global warming is to increase the use of solar energy to the point that less sunlight gets to the earth to warm it, with two positive results- less use of fossil fuels, thereby decreasing greenhouse gases, and less absorbtion of heat by the earth, thereby counteracting the warming of the atmosphere.

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