There's No Proof Roundup Causes Cancer But Questions Linger

  • Bayer AG loses again to a plaintiff that says it causes cancer
  • Emerging studies examine consequences of chronic exposure
Roundup weed killer

Photographer: Jasper Juinen/Bloomberg

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The world’s regulators agree that the active ingredient in popular weedkiller Roundup is unlikely to cause cancer. Yet manufacturer Bayer AG keeps losing in court to plaintiffs who say it gave them the disease.

So is glyphosate, the world’s most widely used weedkiller, really dangerous?