Global warming is real and human activity is the main cause. The consequences are mainly negative and headed toward catastrophic, unless we act. However, the good news is that we can meet this challenge. It is not too late, and we have everything we need to get started.

Fear is the most powerful enemy of reason.

I am old enough to know that a red carpet is just a rug.

It's a blessing to have work that feels fulfilling.

I don't have the illusion that there's any position or role in the world with as much potential for bringing about change as that of president of the United States.

Global warming pollution, indeed all pollution, is now described by economists as an “externality.” This absurd label means, in essence: we don’t to keep track of this stuff so let’s pretend it doesn’t exist.

Every nation has a moral obligation to safeguard the future.