TOM MYERS / SCIENCE PHOTO LIBRARY TOM MYERS / SCIENCE PHOTO LIBRARY
Field in California undergoing fumigation with Methyl Bromide and Chloropicrin. Methyl bromide is used as a soil sterilant to kill seeds and plant pests before planting. A greenhouse gas, its use internationally has been restricted under the Montreal protocols, though the US has successfully lobbied for waivers to allow its use in critical agricultural applications. Chloropicrin is also used to control soil pests, especially nematodes. It is also a lacrimator and respiratory irritant that was used by the Germans in World War 1 as a chemical warfare agent.
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