Forests in the eastern United States appear to be growing faster in response to rising levels of carbon dioxide in the atmosphere, a new study has found.

The study centered on trees in mixed hardwood stands on the western edge of the Chesapeake Bay in Maryland that are representative of much of the those on the Eastern Seaboard.

All are growing two to four times as fast as normal, according to a study published in Tuesday’s issue of The Proceedings of the National Academy of Sciences.

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