Guy Mussey, horticulture specialist with Virginia Cooperative Extension in Stafford County, said increased CO2 would definitely mean increased poison ivy, but it would also mean an increase in every other plant.
"It's very common for greenhouses to use CO2 to make their plants grow," he
said it's scientifically possible to link global warming to an increase in poison ivy.
But "to tell you the truth, there are plenty of other things to worry more about [with] global warming than more poison ivy," Mussey
added: "I've been on the lookout and haven't seen more of it this year, but I haven't done any measurements."