(CNN) — For roughly 1 in 4 American adults, spring blooms mark the start of itchy, eye-watering, congested misery.
And looked at any number of ways, it’s only getting worse: Experts agree that more people are becoming allergic
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One consequence of human-caused climate change is that warm temperatures are persisting into the fall. Among other things, that means that plants have more time to produce and release pollen that irritates millions of allergy sufferers across the country. A recent report from Climate Central found that the freeze-free growing season for ragweed has grown by an average of 11 days since 1970 in some 160 cities.