John Draper pours glyphosate into the tank of his sprayer at the University of Maryland's Wye Research and Education Center.
Dan Charles/NPR
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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.
Jon Griggs has been ranching in northern Nevada for more than 30 years. Fires have always been a part of this landscape, he says, but in the past 20 years, he has seen a significant increase.
Ashley Ahearn for NPR
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John Draper pours glyphosate into the tank of his sprayer at the University of Maryland's Wye Research and Education Center.
Dan Charles/NPR
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