CLIMATE - Rise in temperatures and carbon dioxide levels are boosting pollen, extending allergy seasons

There may be different opinions about the causes of climate change, but experts say there is no denying its existence-and the effects are nothing to sneeze at. Researchers say global warming is leading to larger plants, earlier and more robust pollination and, as a result, worsening allergies.

http://medicalxpress.com/news/2013-03-temperatures-carbon-dioxide-boos