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.
Europe’s farmers have endured sweltering heatwaves and droughts in recent years. But many producers also face an altogether different problem - sharp spring frosts that decimate harvests.
It’s been a warm winter in Pittsburgh and other parts of Pennsylvania. Daffodils have been blooming for weeks, and even trees are budding. So is spring here?
