All Renewables Are Not Created Equal

That is what some science guys in Greece have discovered. They studied the output of solar, wind, and geothermal resources over the course of a whole life cycle assessment to ensure its pedi-green. They wanted to determine what the total environmental impact would be from these sources over the life of the system, and how energy output compared to that of fossil fuels.

They found that wind and geothermal sources were as efficient as their fossil fuel counterparts over one cycle. Solar sources were less efficient on the smaller scale than fossil fuels, but could be more efficient than fossil fuels on larger scales.

I don't know what happened to hyperlinking so here is the article: http://www.sciencedaily.com/releases/2007/08/070813153419.htm