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When will Renewable Energy be Mainstream?

How large a role will wind and solar play in our emerging energy landscape? At the heart of that debate lies the question as to whether these renewable technologies (whose fuel is free unlike the extractive fuels costs of both fossils and nuclear power) will expand the way other extractive energy sources have, or the way that other new technologies have. Consider these three factual statements side by side: 1) wind and solar today represent less than 5% of the energy the world consumes today; 2) wind and solar now represent roughly 50% of the new energy capacity being built each year; and 3) a growing number of consumers have purchased enough wind and solar to cover 100% of their annual ener

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