The negative cautions of science are never popular.

We are living beyond our means. As a people we have developed a life-style that is draining the earth of its priceless and irreplaceable resources without regard for the future of our children and people all around the world.

Everybody's suffering is mine but not everybody's murdering ... I do not distinguish for one moment whether my child is in danger or a child in central Asia. But I will not accept responsibility for what other people do because I happen to belong to that nation or that race or that religion. I do not believe in guilt by association.

Parents feel like immigrants in the country of the young.

It was not until we saw the picture of the earth, from the moon, that we realized how small and how helpless this planet is - something that we must hold in our arms and care for.

Contentment can be bought at a price that one can not possibly pay.

We — mankind — stand at the center of an evolutionary crisis, with a new evolutionary device — our consciousness of the crisis — as our unique contribution.