Those who ignored Earth Day, well that’s one thing. Those who ignore the crisis of our planet, that’s quite another. The indifferent have missed the point – that to clean up the air and earth and water in the few years science says we have left to us, means personal involvement and personal sacrifice. America must undertake a revolution in its way of life – to scale down its standards of living. Someday, the world will be a better place — if it listens and acts… to clean up the mess that each of us has made. What is at stake, and what is in question, is our survival.

This is Walter Cronkite.