Even under optimistic projections, heavily subsidized wind and solar would each amount to a tiny fraction of global energy by 2030 and thus cannot be the main answer to energy-security or environmental problems.

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People in a much larger region of the world can anticipate seeing a partial solar eclipse, in which the moon blocks only a fraction of the sun's disk.

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Theoretically, Filler said, if some fraction of the LED were projected backwards into the system, embedded solar cells could capture some of that light as well.

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