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Technology Review's Briefings are primers on key emerging technologies that promise to be transformational in their impact.

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Introduction

Scientists generally agree that to limit global warming to less than 2.4 °C--and avoid the worst effects of climate change--greenhouse-gas emissions must be reduced 50 percent by 2050. But humanity is a long way from being weaned from the petroleum, natural gas, and coal whose use causes much of this pollution.

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