If we don't succeed, we run the risk of failure.

As human beings, we are vulnerable to confusing the unprecedented with the improbable. In our everyday experience, if something has never happened before, we are generally safe in assuming it is not going to happen in the future, but the exceptions can kill you and climate change is one of those exceptions.

A president who breaks the law is a threat to the very structure of our government.

While President Bush likes to project an image of strength and courage, the real truth is that in the presence of his large financial contributors, he is a moral coward.

Civil disobedience has an honourable history, and when the urgency and moral clarity cross a certain threshold, then I think that civil disobedience is quite understandable, and it has a role to play.

Airplane travel is nature's way of making you look like your passport photo.

Population growth is straining the Earth's resources to the breaking point, and educating girls is the single most important factor in stabilizing that. That, plus helping women gain political and economic power and safeguarding their reproductive rights.

I was in elective politics for 24 years. I've made four national races, two for President, two for Vice President. I have found there are other ways to serve, and I'm enjoying them.

The day I made that statement, about the inventing the internet, I was tired because I'd been up all night inventing the Camcorder.

I'm naturally an optimist, but my basis for hope is rooted in my understanding of human nature.

I have faith in the United States and our ability to make good decisions based on the facts.

Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination.

I think the cost of energy will come down when we make this transition to renewable energy.

I took the initiative in moving forward a whole range of initiatives that have proven to be important to our country's economic growth, environmental protection, improvements in our educational system.

Our democracy, our constitutional framework is really a kind of software for harnessing the creativity and political imagination for all of our people. The American democratic system was an early political version of Napster.