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American Trees Are Moving West, and No One Knows Why

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As the consequences of climate change strike across the United States, ecologists have a guiding principle about how they think plants will respond. Cold-adapted plants will survive if they move “up”—that is, as they move further north (away from the tropics) and higher in elevation (away from the warm ground). A new survey of how tree populations have shifted over the past three decades finds that this effect is already in action. But there’s a ...
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