I'm not so optimistic as to think that you would ever be able to garner a majority of an American Congress that would make those kinds of investments above and beyond the kinds of investments that could be made in a progressive program for lifting up all people.

There's one issue that will define the contours of this century more dramatically than any other, and that is the urgent and growing threat of a changing climate.

All across the world, ...increasingly dangerous weather patterns and devastating storms are abruptly putting an end to the long-running debate over whether or not climate change is real. Not only is it real, it's here, and its effects are giving rise to a frighteningly new global phenomenon: the man-made natural disaster.

Increasing America’s debt weakens us domestically and internationally. Leadership means that 'the buck stops here.' Instead, Washington is shifting the burden of bad choices today onto the backs of our children and grandchildren. America has a debt problem and a failure of leadership.

Obviously I'm grayer, a few more wrinkles. One of the things I'm proud about is that I think my basic character and outlook actually have not changed much. And people who are closest to me will tell you that the guy who came here is the same guy who's leaving.

It is this world, a world where cruise ships throw away more food in a day than most residents of Port-au-Prince see in a year, where white folks' greed runs a world in need, apartheid in one hemisphere, apathy in another hemisphere...That's the world! On which hope sits!

Of course, there's been a real debate about where to invest and where to cut, and I'm committed to working with members of both parties to cut our deficits and debt. But we can't simply cut our way to prosperity.