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30 percent of the energy sent to Earth bounces back into outer space. Climate change could upend that.

Our swiftly dimming planet. A material's albedo tells us how well it reflects the sun's energy. Valerio Pellegrini If you’ve ever made the mistake of wearing a black shirt on a sweltering day, you know that dark colors absorb the sun’s heat, while light colors reflect it. Our planet works the same way. White surfaces, like…

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