things are getting itchier

Another reason to worry about global warming: more and itchier poison ivy.

The noxious vine grows faster and bigger as carbon dioxide levels in the atmosphere rise, researchers report Monday. Their study appears in this week’s Proceedings of the National Academy of Sciences.

“The fertilization effect of rising CO2 on poison ivy … and the shift toward a more allergenic form of urushiol have important implications for the future health of both humans and forests,” the study concludes.

NBC News, 30 May 2006