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It's a warm, sunny day in April, and all the trees are in bloom. But how did they know it was warm and sunny? And on a warm, sunny day in February, what keeps them from blooming? Scott Aker, a horticulturalist at the U.S. National Arboretum, tells Robinson Meyer how the process works and what to look for.

An interesting bit on efforts to clone a giant redwood tree and plant saplings from that tree in an effort to increase the amount of carbon absorbed from the environment.