Potent Poison Ivy

MADISON, Wis. (AP) -- A poison-ivy rash is never any fun. But this year the itching might be worse.

Botanists say there are record-high carbon-dioxide levels -- and that's causing poison-ivy plants to grow faster and with more potency.

Tom Sharkey is a botany professor at the University of Wisconsin-Madison. He says 300,000 cases of poison ivy are reported every year to the federal Centers for Disease Control.

He says he expects that number to increase this year as people get poison-ivy rashes, just like he did last year.

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