invasion – poison ivy

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Lewis H. Ziska, a research weed ecologist with the U.S. Department of Agriculture, said laboratory and field studies show that poison ivy is advancing with climate change.

“That trend will continue as carbon dioxide levels keep rising from the current average level of about 400 parts per million to 560 ppm or higher in the next 30 to 50 years, with predicted levels reaching 800 ppm by century’s end. Already poison ivy’s growth and potency has doubled since the 1960s, and it could double again once CO2 levels reach the 560 ppm mark,” Mr. Ziska said.

As a result, Americans might have to scratch their way into a climate-altered future.Pittsburgh Post Gazettte, 22 Jul 2013