A Revelation About Trees Is Messing With Climate Calculations

Every year between September and December, Lubna Dada makes clouds. Dada, an atmospheric scientist, convenes with dozens of her colleagues to run experiments in a 7,000-gallon stainless steel chamber at CERN in Switzerland. “It’s like science camp,” says Dada, who studies how natural emissions react with ozone to create aerosols that affect the climate.

Clouds are the largest source of uncertainty in climate predictions. Depending on location, cloud cover can reflect sunlight away from land and ocean that would otherwise absorb its heat—a rare perk in the warming world. But clouds can also trap heat over Arctic and Antarctic ice. Scientists want to know more about what causes clouds to

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