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Stacking up carbon

Mosses that grew in Alaskan peatlands less than 8,600 years ago (samples at left, second from left) have decomposed more quickly and accumulated carbon at a rate only one-fourth that of mosses that grew between 8,600 and 11,500 years ago (third from left, far right), thanks to the recent trend toward decreasing seasonality in the form of cooler summers and warmer winters. Credit: Yu and Jones

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