What is even more interesting is that in the past, warmer climates meant a burst and expansion of living things. It is only this current warming that is considered to be harmful to life.
When my husband and his brother had to decide whether or not to sell the 40 acres they owned in southern Illinois, we drove there to see it. The neighboring farmer who wanted to buy it pointed out the luxuriously growing poison ivy and said it has been getting a lot worse. Separate study shows that poison ivy loves higher CO2 levels.