Yes, this is hard. But there should be no question that the United States of America is stepping up to the plate. We recognize our role in creating this problem; we embrace our responsibility to combat it. We will do our part, and we will help developing nations do theirs. But we can only succeed in combating climate change if we are joined in this effort by every nation - developed and developing alike. Nobody gets a pass.

The problem was, and we saw some of this in the immigration-reform issues as well, was they hadn't done sufficient homework to know that I didn't have all the capacity they thought I did in order to just execute this through the stroke of a pen.

This is an extraordinary achievement, nearly nine years in the making.

I think, as you get older, that's when your ambitions become "peculiar".

I [give] maybe the long-winded speeches that not everybody reads, but I can also do a slow jam on Jimmy Fallon better than most.

Our government shouldn't make promises we cannot keep, but we must keep the promises we've already made.

If you've got a business - you didn't build that.