"Our country has suffered from an on-again, off-again energy policy that has failed to get us to energy independence. As President Obama has said, we need a comprehensive energy plan for the country that includes conventional resources like oil and gas, but that also takes advantage of wind, solar, biomass, geothermal, and other renewable resources."

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The sunlight ... that strikes Earth’s land surface in two hours is equivalent to total human energy use in a year. While much of that sunlight becomes heat, solar energy is also responsible for the energy embodied in wind, hydro, wave, and biomass, each with the potential to be harnessed for human use. Only a small portion of that enormous daily, renewable flux of energy will ever be needed by humanity.

— Christopher Flavin