NPR

Safe Or Scary? The Shifting Reputation Of Glyphosate, AKA Roundup

The world's most widely used weed killer was once seen as one of the safest pesticides. Now it is blamed for causing cancer. Yet the scientific evidence remains disputed.
John Draper pours glyphosate into the tank of his sprayer at the University of Maryland's Wye Research and Education Center.

John Draper and I are sitting in the cab of a tractor on the research farm he manages for the University of Maryland, alongside the Chesapeake Bay. Behind us, there's a sprayer.

"So, away we go!" Draper says. He pushes a button, and we start to move. A fine mist emerges from nozzles on the arms of the sprayer.

We're spraying glyphosate, killing off this field's soil-building "cover crop" of rye before planting soybeans.

Farmers have been using this chemical, often under the trade name Roundup, for about four decades now.

But now it's under fierce attack, accused of causing cancer. In three civil so far, U.S.juries have ordered Roundup's inventor, Monsanto, now owned by Bayer, to pay enormous to cancer survivors. Thousands more lawsuits have been filed.

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