When people ask me what they should do, I reply, "Get informed, get outraged, and then get political."

The Asia-Pacific Partnership is a climate suicide pact. It is playing Russian roulette with six bullets in your gun.

Some 3 million years ago, when the earth was a little more than 3°C warmer than preindustrial levels (about 2.2°C warmer than today), Antarctica had far less ice and sea levels were a stunning 25 meters higher than today. If we stay on our current emissions path, the planet will almost certainly be that warm by the century's end.

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 science is crystal clear: we humans are the primary cause of global warming, and we face a bleak future if we fail to act quickly.

The best thing about improvements in health care is that all the climate-change deniers are now going to live long enough to see how wrong they were.

Much of the scientific community has been astonished that their increasingly strong and detailed warnings have been either ignored or attacked.