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.

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.

The most important environmental issue is one that is rarely mentioned, and that is the lack of a conservation ethic in our culture.

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.

Dr. S. Dillon Ripley, secretary of the Smithsonian Institute, believes that in 25 years, somewhere between 75 and 80 percent of all the species of living animals will be extinct.

Our air, water, soil, forests, oceans, rivers, lakes, scenic beauty, wildlife habitat, minerals, that is the wealth of the country.

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