Aspen trees grow faster with increasing amounts of carbon dioxide in the atmosphere, say researchers from the University of Wisconsin-Madison and the University of Minnesota. â??We were quite surprised to see this large of a response,â? says Rick Lindroth, an ecologist at the University of Wisconsin-Madison and an author of the study. â??We wouldnâ??t have been surprised to see some effect, but a 53% increase is a whopping increase.â?
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