Global warming means longer allergy seasons: [bogus] study

Ragweed allergy season in North America has grown two to four weeks longer in recent years because of warmer temperatures and later fall frosts, researchers said.

Northern parts of the United States and Canada have seen the most dramatic rise in allergy season length between 1995 and 2009, said the study to be published in Tuesday's edition of the Proceedings of the National Academy of Sciences.