Butterflies move north as climate warms

Mother Nature Network: Native butterflies are vanishing from parts of the U.S. Northeast, a new Harvard University study finds, while warmer-natured southerners are increasingly invading their turf. This coincides with a half-century warming trend in the region, raising concerns that these rapid ecological shifts are a symptom of climate change. Published Aug. 19 in the journal Nature Climate Change, the study is based on two decades of research by amateur experts — aka "citizen scientists" — who logged species counts...

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