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Nonorganic cotton--known in the business as "conventional" cotton--is among agriculture's dirtiest crops. One-fifth of insecticides--and more than 10 percent of all pesticides--are devoted to the protection of conventional cotton, though it is grown on only 2.5 percent of the world's arable land. The World Health Organization has classed eight out of ten of America's most popular cotton pesticides as "hazardous."