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.

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

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

Time is short. We have at most a decade to sharply reverse course.

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 great political tragedy of our time is that conservative leaders in America have chosen to use their superior messaging and political skills to thwart serious action on global warming.

As long as a handful of U.S. scientists, most receiving funds from the fossil fuel industry, get equal time with hundreds of the world's leading climate scientists, the public inevitably ends up with a misimpression about the state of our scientific understanding.