When I was in Washington, I would usually get home from the Capitol at about 7:30 or 8, and I would try to write as much as possible. It was almost all in the wee hours.

America, our endless blessings bestow an enduring burden. But as Americans, we welcome our responsibility to lead.

The bottom line is that it's hard to find a model in which you can practically administer and sustain political support for those kinds of efforts. And what makes America complicated as well is the degree to which this is not just a black/white society, and it is becoming less so every year.

There is probably a perverse pride in my administration... that we were going to do the right thing, even if short-term it was unpopular. And I think anybody who's occupied this office has to remember that success is determined by an intersection in policy and politics and that you can't be neglecting of marketing and P.R. and public opinion.

Every three weeks, we bring online as much solar power as we did in all of 2008...That’s why, over the past six years, we’ve done more than ever before to combat climate change, from the way we produce energy, to the way we use it.

Sometimes it may seem as if progress is stalled but what history of post-war Germany shows is that strength and determination and focus and adherence to the values that we care about will result in a better future for our children and our grandchildren.

This was the moment when the rise of the oceans began to slow and our planet began to heal.