For a tree pollen allergy sufferer like me, spring is torture. Flowering trees are my kryptonite, and during peak bloom it feels like pollen stokes a six-week permasneeze from which there’s no reprieve until the end of June. And since 2018’s Fourth National Climate Assessment suggests that increasing carbon dioxide means an earlier, longer pollen season and higher levels of airborne allergens, it might last even longer in the future.
I’m far from alone in my sneezing. According to a 2017 survey conducted by the Centers for Disease Control and Prevention, 19.9 million Americans reported being diagnosed with hay fever

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