Glyphosate has killed all the bees.

The controversial herbicide Roundup has been accused of causing cancer in humans and now scientists in Texas argue that the world's most popular weed killer could be partly responsible for killing off bee populations around the world.

A new study by scientists at the University of Texas at Austin posit that glyphosate — the active ingredient in the herbicide — destroys specialized gut bacteria in bees, leaving them more susceptible to infection and death from harmful bacteria.

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