Climate change assumption could need tinkering, study finds

LA Times: A common assumption in models that game out what a warming planet will mean for plants and trees presumes they would migrate upward toward cooler mountain temperatures, such as the snowy peaks of California's Sierra Nevada. That has sparked concern that some species may die off when they cannot migrate higher. It turns out that decades of old and new data show that many Sierra species have tended to migrate downhill over many decades, largely because of higher precipitation levels in central and......

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