I make no apologies for us wanting to do this [bombing Iraq and Syria] appropriately and in a way that is consistent with American values.

For the sake of our children and our future, we must do more to combat climate change. Now, it's true that no single event makes a trend. But the fact is the 12 hottest years on record have all come in the last 15. Heat waves, droughts, wildfires, floods-all are now more frequent and more intense. We can choose to believe that Superstorm Sandy, and the most severe drought in decades, and the worst wildfires some states have ever seen were all just a freak coincidence. Or we can choose to believe in the overwhelming judgment of science-and act before it's too late.

Do not tell me that we're not drilling. We're drilling all over this country. I mean, I guess there's some - there are a few spots where we're not drilling. We're not drilling in the national mall. We're not drilling at your house. I guess we could try to have like, you know, 200 oil rigs in the middle of Chesapeake Bay.

The president of the United States is supposed to lead the free world and not follow it. Other nations have been more outspoken. So, I hope that we'll hear more of this because young men and women taking to the streets in Tehran need our support. The signs are in English. They're basically asking for us to speak up on their behalf.

Someday, our children, and our children’s children, will look at us in the eye and they'll ask us, did we do all that we could when we had the chance to deal with this problem and leave them a cleaner, safer, more stable world?

I've said to [Donald Trump], and I think others have said to him that the day that he is the President of the United States, there are world capitals and financial markets and people all around the world who take really seriously what he says, and in a way that's just not true before you're actually sworn in as president.

The biggest deficit that we have in our society and in the world right now is an empathy deficit. We are in great need of people being able to stand in somebody else's shoes and see the world through their eyes.