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.

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

If the politics of inaction and delay that have triumphed in this country continues for another decade, then Planetary Purgatory in the likely future facing our country before midcentury - probably in your own lifetime.

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

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.

Replacing half of the U.S. ground-transport fuels with hydrogen from wind power by 2050, for example, might require 1,400 gigawatts of advanced wind turbines or more... replacing those fuels with electricity might require less than 400 GW.

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