Throughout history, religious wars have always been the most brutal and cruel and merciless.

The survival of the United States of America as we know it is at risk. And even more — if more should be required — the future of human civilization is at stake.

Even if we give first priority to the destruction of terrorist networks, and even if we succeed, there are still governments that could bring us great harm. And there is a clear case that one of these governments in particular represents a virulent threat in a class by itself: Iraq. As far as I am concerned, a final reckoning with that government should be on the table.

You can push your local communities to adopt more sustainable sources of energy and environmentally-friendly practices.

What changed in the United States with Hurricane Katrina was a feeling that we have entered a period of consequences.

We face a climate crisis now that is the most serious challenge our civilization has ever confronted. And the greatest country in the world [America] has to remain a part of this unprecedented global agreement to deal with it.

I've learned the importance of changing people's minds at the grassroots level so that whoever does run will have a much better chance of encountering public opinion that reaches a critical mass and brings about a change not only in White House policies but in the Congress and in the state legislatures and all around the world.