I know that there are those who disagree with the overwhelming scientific evidence on climate change. But here's the thing -- even if you doubt the evidence, providing incentives for energy-efficien cy and clean energy are the right thing to do for our future -- because the nation that leads the clean energy economy will be the nation that leads the global economy. And America must be that nation.

What I remember thinking at that point, having gone through both the ups and downs of my first four years, and seeing the sea of people was, "What a remarkable country this is and how lucky am I that we live in a place where the son of a single mom, not born into any kind of fame or fortune, in a pretty remote state somehow can end up be in a position to - to make a difference."

There are places and moments in America where this nation’s destiny has been decided...Selma is such a place.

I wanna thank the German people for the incredible partnership that our countries have been able to establish all these years.

I think we would have made a lot more mistakes and would have accomplished a lot less had we not been grounded in some basic truths.

What we have done, I think, is build a model from a lot of hard lessons in Afghanistan and Iraq but in other places around the world, where we are working with them in an advisory capacity.

What is certainly true is that the American people, just like the German people, just like the British and people around the world, are seeing extraordinarily rapid change. The world is shrinking, the economies have become much more integrated and demographics are shifting.