Erin Ross Jun 29
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It's official: A commonly used pesticide can harm bees

Mark Chinnick / Flickr

Bee populations are collapsing, and numerous studies have implicated neonicotinoid pesticides. But critics say those studies dose the bees with more pesticides than they would experience in the wild. Two multi-year field studies, published today in Science, show that real-world doses can harm bees under many conditions, which could settle much of the debate raging around the insecticide.

"These bees aren't being force-fed, they're just doing what they would normally do," says Jeremy Kerr, who studies bees at the University of Ottawa.

Why it matters: Bees don't just make honey: they're an integral part of the world's agricultural system. In the U.S., they are shipped across the country to pollinate crops, and wild bees help plants reproduce across the globe. If bee populations crash, the economic and environmental consequences could be severe.