Nature provides a free lunch, but only if we control our appetites.
The best time to plant a tree was 20 years ago. The second best time is now.
The Earth does not belong to us: we belong to the Earth.
The greatest threat to our planet is the belief that someone else will save it.
We won't have a society if we destroy the environment.
We do not inherit the Earth from our ancestors; we borrow it from our children.
Earth provides enough to satisfy every man's needs, but not every man's greed.