From NPR
No chemical used by farmers, it seems, gets more attention than glyphosate, also known by its trade name, Roundup. That’s mainly because it is a cornerstone of the shift to genetically modified crops, many of which have been modified to tolerate glyphosate. This, in turn, persuaded farmers to rely on this chemical for easy control of their weeds. (Easy, at least, until weeds evolved to become immune to glyphosate, but that’s a different story.)
Glyphosate had been considered among the safest of herbicides. So it was a shock to many, last year, when the International Agency for Research on Cancer announced that this chemical is probably carcinogenic. Read the rest of the story here.