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Tropical forests soak up huge amounts of greenhouse gas. Climate change could end that

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Researchers collect leaves to measure carbon storage in an Andean cloud forest. By Elizabeth PennisiTropical forests have been one of Earth’s best defenses against rising carbon dioxide levels.

The trees suck carbon from the atmosphere as they grow, and researchers estimate that, despite ongoing deforestation, tropical forests hold more carbon than humanity has emitted over the past 30 years by burning coal, oil, and natural gas.

But scientists have worried that the ability of tropical forests to act as carbon sinks will diminish and ultimately reverse with continued global warming, as trees stressed by heat and drought die and release their carbon.Today in Science, researchers report that measurements of carbon storage and growing

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