"The evidence we have is that toxics reduce the intelligence of children, and members of the first heavily influenced generation are now adults. The first empirical evidence we are dumbing down Homo sapiens were the – and the resultant . On the other hand, toxification may solve the population problem, since sperm counts are plunging."
January 1, 1970
https://en.wikiquote.org/wiki/Paul_R._Ehrlich