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In this Feb. 13, 2019 photo, project technician Robert Tunison, who spends between 30 minutes to an hour per leaf, collects plant physiology data inside the El Yunque tropical rainforest, in Rio Grande, Puerto Rico. In this corner of northeast Puerto Rico, U.S. scientists are trying to figure out how Earth might recover from extreme weather events amid increasingly warmer temperatures. (AP Photo/Carlos Giusti)

In this Feb. 13, 2019 photo, project technician Robert Tunison, who spends between 30 minutes to an hour per leaf, collects plant physiology data inside the El Yunque tropical rainforest, in Rio Grande, Puerto Rico. In this corner of northeast Puerto Rico, U.S. scientists are trying to figure out how Earth might recover from extreme weather events amid increasingly warmer temperatures. (AP Photo/Carlos Giusti)

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