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.

The fate of the living planet is the most important issue facing mankind.

Teddy Roosevelt of course was a great outdoorsman all his life.

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

We must realize that we're all part of a web of life around the world. Anytime you extinguish a species, the consequences are serious.

As far as I know, most organizations are avoiding population issues because they're politically frightened by the charge that comes from some proponents of immigration that if you oppose the immigration policy we have now, you're a racist.. There is no way in the world we can forge a sustainable society without stabilizing the population. ... There's no practical way of stabilizing the population of the U.S. without reducing the immigration rate. When do we decide we have to do something, or do we wait until things are as bad here as they are in the countries people want to leave?