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Earth was not built for six billion people all running around and being passionate about things. The world was built for about two million people foraging for roots and grubs.

Nature doesn't need people - people need nature; nature would survive the extinction of the human being and go on just fine, but human culture, human beings, cannot survive without nature.

For centuries, building materials were free. You want to build a house, you cut down some trees. But we haven't been thinking about the cost to the planet.

Animals weren't put on this earth to entertain us.

We agree that man was not created to survive in space.

For too long, humanity has acted with an outrageous lack of responsibility. We wanted everything for ourselves: greed, really. We failed to look at the overall picture and did not take into consideration those with whom we share the world.

We survived on natural resources, so we should take care of the earth. When I leave home, I do things like switching off the heat and lights.

Civilization as it is known today could not have evolved, nor can it survive, without an adequate food supply.