I believe that the average guy in the street will give up a great deal, if he really understands the cost of not giving it up. In fact, we may find that, while we're drastically cutting our energy consumption, we're actually raising our standard of living.

Have fun saving the world, or you are just going to depress yourself.

Keep your rivers flowing as they will, and you will continue to know the most important of all freedoms-the boundless scope of the human mind to contemplate wonders, and to begin to understand their meaning.

It seems that every time mankind is given a lot of energy, we go out and wreck something with it.

There is more inside you than you dare think.

For how many people do you think might yet stand on this planet before the sun grows cold? That's the responsibility we hold in our hands.

Politicians are like weather vanes. Our job is to make the wind blow.