Poison Ivy is warming up.

Researchers say global warming is creating bigger, itchier poison ivy vines, the Philadelphia Inquirer reported.

They suspect the rising levels of CO2 were responsible for the rapid increase in poison ivy.

Duke University researchers exposed poison ivy vines to air with elevated levels of carbon dioxide, matching what climatologists predict for the year 2050, and found that the plants grew nearly 150 percent faster than the vines exposed to normal air.

The plants were also 30 percent more irritating, the study in the Proceedings of the National Academy of Sciences said.