Global warming means longer allergy seasons: 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.
Environment
Feb 21, 2011
171
0
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.
Environment
Feb 21, 2011
171
0
