You've probably heard by now that bees are dying in record numbers. They're being poisoned by pesticides while urbanization encroaches on bees' natural habitats, leaving them with fewer places to live and fewer wildflowers to feed on, says Harvard biologist James Crall, who studies bumblebees. The die-off comes as the world’s human population is expected to grow from 7 billion in 2010 to 9.

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