If we continue to address the issue of the environment where we live as though we're the only species that lives here, we'll create a disaster for ourselves

I think the internal combustion engine will disappear from the streets of our cities in the next thirty years because transportation will be mass transportation, or probably electrical power.

It was truly an astonishing grassroots explosion, ... The objective was to get a nationwide demonstration of concern for the environment so large that it would shake the political establishment out of its lethargy.

In the state of Wisconsin it's mandated that teachers in the social sciences and hard sciences have to start giving environmental education by the first grade, through high school

Reaching a general understanding that sustainability is the ultimate issue will finally bring us face-to-face with the political challenge of forging a sustainable society during the next few decades. It is a challenge we can meet if we have the leadership and the political will to do so.

We're going to have to do a whole lot more, and give nature at least a chance to repair some of the damage we've done.

The ultimate test of a man's conscience may be his willingness to sacrifice something today for future generations whose words of thanks will not be heard.