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Climate change is worsening allergy season, scientists find
allergies are driven by the pollen in the air.But, according to scientists, the warming of the plant is making winter shorter, causing plants, including trees, grass and flowers, to bloom earlier and for longer periods of time — contributing to a worsening allergy season for millions of Americans. California poppies and Canterbury bells bloom at Diamond Valley Lake, near Hemet, California. (Credit: David McNew/Getty Images) In addition, climatologists say excess carbon dioxide generated from burning fossil fuels is helping make even more pollen, thus adding to the problem. "Pollen seasons have, are now starting about 20 days earlier, and there’s about 20 percent more pollen in the air," said William Anderegg, a biologist and climate scientist at the University of Utah. And, while Sunday marks the official first day of spring, many people in the U.S.