A change is brought about because ordinary people do extraordinary things.

This is the moment when we must come together to save this planet. Let us resolve that we will not leave our children a world where the oceans rise and famine spreads and terrible storms devastate our lands.

The American people recognize that their careers or their kids' careers are going to have to be more dynamic. That they might not be working at a single plant for 30 years. That they might have to change careers. They might have to get more education. They might have to retool or retrain. And I think the American people are game for that.

What I believe unites the people of this nation, regardless of race or region or party, young or old, rich or poor, is the simple, profound belief in opportunity for all - the notion that if you work hard and take responsibility, you can get ahead.

We've persevered because of a belief we share with the Iraqi people - a belief that out of the ashes of war, a new beginning could be born in this cradle of civilization. Through this remarkable chapter in the history of the United States and Iraq, we have met our responsibility. Now, it's time to turn the page.

What used to be racial segregation now mirrors itself in class segregation, this great sorting (has) taken place. It creates its own politics. There are some communities where not only do I not know poor people, I don't even know people who have trouble paying the bills at the end of the month. I just don't know those people. And so there's less sense of investment in those children.

We know the battle ahead will be long, but always remember that no matter what obstacles stand in our way, nothing can stand in the way of the power of millions of voices calling for change. We have been told we cannot do this by a chorus of cynics. They will only grow louder and more dissonant. We've been asked to pause for a reality check. We've been warned against offering the people of this nation false hope. But in the unlikely story that is America, there has never been anything false about hope.