Rooftop solar photovoltaics go a step beyond electricity, offering a means for collecting rainwater.
Learn more about how much energy the sun produces and why we need to utilize this energy for our own electricity.
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These figures are in millions. The source for energy R&D expenditures is from the National Council for Science and the Environment. Take a look here. Though the war in Iraq now costs about $120B a year, two authors (one a Nobel prize winner) estimates the