Research looks at how poison ivy leaves changed by climate change
05:09
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Kara Holsopple, The Allegheny Front
Mason Heberling, associate curator of botany at the Carnegie Museum of Natural History, holds a poison ivy specimen collected in Lehigh County, Pa. in 1840, the oldest used in the study. (Kara Holsopple/The Allegheny Front)
A new study looks at museum specimens to find out how increased carbon dioxide in the atmosphere has altered the leaves of poison ivy in Pennsylvania.
