On moral grounds, I think that if you believe a certain outcome is a very possible outcome, you have an obligation to tell people that. With global warming, the probability of a bad outcome if we stay on our current emission trends is incredibly high. If you know a bad outcome is likely to happen, what right do you have not to communicate that? You go into a doctor's office, what are they going to do - not tell you the diagnosis?

Bush and Inhofe will go down in history with other leaders such as Herbert Hoover and Neville Chamberlain who were blind to their nation's gravest threats.

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.

You must become a climate champion, a single-issue voter. You must take whatever action you can. You must use whatever influence you have wherever it would make a difference, even if it is only to educate the people around you.

The United States could dramatically reduce its carbon emissions per kilowatt-hour without raising its overall energy bill.

Ideology trumps rationality. Most conservatives cannot abide the solution to global warming - strong government regulations and a government-led effort to accelerate clean-energy technologies in the market.

On our current path, all our great Gulf and Atlantic coast cities are at risk of meeting the same fate as New Orleans.