Climate Change and Health: Allergies: Pollen and Poison Ivy

More days above freezing creates a longer growing season, which in turn means a longer allergy season. More carbon dioxide in the atmosphere also means more pollen and stronger pollen for common airborne allergens like ragweed. 

Poison Ivy thrives in a climate changed world.  Plants grow faster, bigger and have more toxic oils with increasing concentration of CO2 in the atmosphere and higher temperatures.