Allergy sufferers are no strangers to problems with pollen. But now, due to climate change, the pollen season is lasting longer and starting earlier than ever before, meaning more days of itchy eyes and runny noses. Warmer temperatures cause flowers to bloom earlier, while higher CO2 levels cause more pollen to be produced.
source https://phys.org/news/2021-02-allergy-season-earlier-year-due.html
