At any given moment, our planet bleeds 100 million gigawatts of infrared radiation back into space. Needless to say, converting this wasted heat to a renewable energy source would be a sure-fire game changer. Physicists from Harvard University may have just figured out how to do it.
Our Earth, which is heated by the sun, is much warmer than the frozen space that surrounds it. This creates a heat imbalance that could be transformed into direct-current (DC) power. But making this happen is considerably easier said than done.
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