We created a way of raising standards of living that we can't possibly pass on to our children.

The world beyond 450 ppm atmospheric concentrations of carbon dioxide, the world that crosses carbon cycle tipping points that quickly take us to 1000 ppm, is a world not merely of endless regional resource wars around the globe. It is a world with dozens of Darfurs. It is a world of a hundred Katrinas, of countless environmental refugees

The last time Earth was 1°C warmer than today, sea levels were 20 feet higher.

Conservative Denyers and Delayers are the main reason America lacks the consensus and the political will to take up the fight against catastrophic climate change.

I've always believed that you should stick as closely to the science as possible. And my biggest advice to reporters has been, if you're doing a climate story, talk to climate scientists. The best climate stories are done by the people who talk to climate scientists.

The entire western Siberian sub-Arctic region is melting, and it has all happened in the last three or four years.

Do believe that if we fail to act in time, it will be the single biggest regret any of us has at the end of our lives.