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

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

Loads of chemicals and hazardous wastes have been introduced into the atmosphere that didn't even exist in 1948. The environmental condition of the planet is far worse than it was 42 years ago.

The wealth of the nation is its air, water, soil, forests, minerals, rivers, lakes, oceans, scenic beauty, wildlife habitats and biodiversity... that's all there is. That's the whole economy. That's where all the economic activity and jobs come from. These biological systems are the sustaining wealth of the world.

Trails are relatively inexpensive. A splendid national network of all kinds of trails can be established at less cost than a few hundred miles of super highway.

The issues are by some geometric number - 100 or 200 or 500 - times more complicated today than we appreciated them to be when Franklin Roosevelt was around.

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?