We're the only species that have crapped up the planet and the only species that can clean it up.

If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake.

When we realize we can make a buck cleaning up the environment, it will be done!

The only way to clean up Chicago is to get rid of Capone.

Fungi are the grand recyclers of the planet and the vanguard species in habitat restoration.

Clean up your own mess.