Impacts 'In every breath we take': How climate change impacts pollen allergies When spring arrives, as many as 81 million Americans experience seasonal allergies. And as the planet warms and more carbon dioxide is pumped into the atmosphere, climate change is lengthening pollen seasons and making them more severe.
Impacts Allergies lasting longer? Blame light pollution Light pollution is disrupting the seasonal rhythms of plants and trees, lengthening pollen season in U.S. cities.
