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1/23/2012

Human development has always depended on energy. We need energy all the time. For heat, for light, to cook, for our health. To operate our cars, our buses and our trains. To charge our phones and power our computers… To manufacture all these things, too. The more of us there are on Earth –there will probably be 9 billion of us by 2050 –the more we’ll need energy, of every kind.

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