Solar Energy – Direct conversions of solar radiation harness by far the largest renewable energy resource but their efficiency and capital operating costs have kept them from making a commercial breakthrough. Photovoltaics would not prevail everywhere because a facility built in a sunny location would produce better results rather than

Low Power Densities of renewable energy. If renewable energy sources were to satisfy significant shares (15-30%) of national demand for fuel and electricity, then their low power densities would translate into very large space requirements – and they would add up to realistically large land claims if they were to

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