she asserted that over time it would accumulate in the environment

In spite of this and other mishaps, the US Department of Agriculture and chemical companies extolled the benefits of DDT.There was little regulation or public awareness about its potential harm.But Carson showed how the overuse of chemicals led to the evolution of resistant species which, in turn, encouraged the development of deadlier chemicals.Since DDT does not dissolve in water,she asserted that over time it would accumulate in the environment,the bodies of insects, the tissues of animals who consume those insects,and eventually humans.
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