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Until the late 1960s, there was little public concern about environmental pollution. It was a matter of experience that pollutants (sewage, industrial wastes) were produced and rejected into what seemed to be the vast expanse of nature—air, rivers, and seas—wherein, somehow, they vanished. Peaks of discontent remain registered,† but, by and large, environmental concerns had no place on political platforms.
Bockris et al. (Mon,) studied this question.