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.
What we are doing to the forests of the world is but a mirror reflection of what we are doing to ourselves and to one another.
The Earth does not belong to us: we belong to the Earth.
The Earth is what we all have in common.
Waste not, want not.
What we save, saves us.
The greatest threat to our planet is the belief that someone else will save it.
The environment and the economy are really both two sides of the same coin. If we cannot sustain the environment, we cannot sustain ourselves.
The environment is where we all meet; where we all have a mutual interest; it is the one thing all of us share.
The environment is everything that isn't me.
We won't have a society if we destroy the environment.
The only way forward, if we are going to improve the quality of the environment, is to get everybody involved.
The environment is where we all meet; where all have a mutual interest; it is the one thing all of us share.
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.
The greatest danger to our future is apathy.