We can no longer afford to consider air and water common property, free to be abused by anyone without regard to the consequences. Instead, we should begin now to treat them as scarce resources, which we are no more free to contaminate than we are free to throw garbage into our neighbor's yard.
Public Papers of the Presidents of the United States: Richard M. Nixon, 1970: (ed. Best Books on, 1971) - ISBN: 9781623769154