The answer is to end our reliance on carbon-based fuels... If we succeed, we create booming new industries, wealth, clean secure energy and maybe we prevent the greatest disaster so far in human history, saving millions of lives while improving billions more. If we fail, basically it's business as usual while things slowly get worse all around us.

There's lots about politics I don't feel comfortable with. To talk about the politics of future ideas is impossible in soundbite form.

The United States has an absolute, uncompromising commitment to Israel's security and an absolute conviction that Israel alone must decide the steps necessary to ensure that security. That is Israel's prerogative. We accept that. We endorse that. Whatever Israel decides cannot, will not, will never, not ever, alter our fundamental commitment to her security.

I never like the question about letter grades, but I think Trump is failing. I think that every day there's another set of tweets and another set of controversies, and nothing seems to be getting done that's any good. And there seems to be kind of a policy paralysis in Washington. Even the appointments he's supposed to make as a new president, so I focus most of all on climate, and so my opinion of his time as president is certainly influenced by my opinion of the job he's done on climate. He's tried to move the country in the wrong direction.

Our insatiable drive to rummage deep beneath the surface of the earth is a willful expansion of our dysfunctional civilization into Nature.

Believe in the power of your own voice. The more noise you make, the more accountability you demand from your leaders, the more our world will change for the better.

In a time of darkness, you don't curse the darkness, you light a candle.