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COVER Policymakers around the world are calling for major energy-consuming nations to move from reliance on fossil fuels to an energy economy mediated by hydrogen. A special section starting on page 957 assesses the prospects for such a transition and describes technological developments necessary for making it a reality. [Image: Stephen R. Wagner]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)