"If the world pollution situation is not critical at the moment, it is as certain as anything can be that the situation will become increasingly intolerable within a very short time. The situation can be controlled, and even reversed; but it demands cooperation on a scale and intensity beyond anything achieved so far. I realize that there are vital causes to be fought for, and I sympathize with people who work up a passionate concern about the all too many examples of inhumanity, injustice, and unfairness; but behind all this hangs a deadly cloud. Still largely unnoticed and unrecognized, the process of destroying our natural environment is gathering speed and momentum. If we fail to cope with the challenge, the other problems will pale into insignificance."