The director of the UN International Agency for Research on Cancer has rebutted criticism of his agency's listing of glyphosate, the most widely used herbicide in the world, as probably carcinogenic to humans in a letter to House Science Committee Chairman Lamar Smith, R-Texas, and House Science Environment Subcommittee Chairman Andy Biggs, R-Ariz.

The letter from IARC Director Christopher Wild was first reported by the Food and Environment Reporting Network.

In the letter, Wild said he was responding to a Nov. 1 letter from Smith and Biggs and that he wanted to correct "repeated misrepresentations" of IARC's methodology in the media.