APRIL 20: Boston Marathon Live on CBSBoston.com, WBZ-TV and WBZ NewsRadio 1030 | Coverage Details
Live Blog | Mile By Mile Guide | Road Closures | Best Spectator Spots | Forecast | All Marathon Coverage

UMass Doctors Research Link Between Allergies And Global Warming

Researchers say the increase of carbon dioxide in the atmosphere is having a direct effect on plants. Kate Merrill reports.