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

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

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.

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.

Peace should be understood in a human way - in a broad social, political and economic way. Peace is threatened by unjust economic, social and political order, absence of democracy, environmental degradation and absence of human rights.

The necessity for rules and strictness is a way of dealing with an enormously powerful impulse: Germans are among the most emotional people on the planet. Maybe it has to do with the fact that, as a nation, they are always drawn back to nature and the forest.

Much as Cold War nuclear strategists could argue about winning a nuclear war by having more survivors, advocates of a Global Warming War might see the United States, Western Europe, or Russia as better able to ride out climate disruption and manipulation than, say, China or the countries of the Middle East.

Some global hazards are insidious. They stem from pressure on energy supplies, food, water and other natural resources. And they will be aggravated as the population rises to a projected nine billion by mid-century, and by the effects of climate change. An 'ecological shock' could irreversibly degrade our environment.