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Between the late 1950s and the late 1980s, more than 750 million tons of chemical wastes were discarded.

Sandra Steingraber (2010). “Living Downstream: An Ecologist's Personal Investigation of Cancer and the Environment”, p.69, Da Capo Press
Between the late 1950s and the late 1980s, more than 750 million tons of chemical wastes were discarded.