The ideas of ancient Greece helped inspire America's founding fathers as they reached for democracy. Our revolutionary ideas helped inspire Greeks as they sought their own freedom.

We want our children to live in an America that isn't burdened by debt, that isn't weakened by inequality, that isn't threatened by the destructive power of a warming planet.

Let's also make sure that a high school diploma puts our kids on a path to a good job. Right now, countries like Germany focus on graduating their high school students with the equivalent of a technical degree from one of our community colleges, so that they're ready for a job. At schools like P-TECh in Brooklyn ... students will graduate with a high school diploma and an associate degree in computers or engineering. We need to give every American student opportunities like this.

I won Iowa not because the demographics dictated that I would win Iowa. It was because I spent 87 days going to every small town and fair and fish fry and BFW Hall, and there were some counties where I might have lost, but maybe I lost by 20 points instead of 50 points. There's some counties maybe I won, that people didn't expect, because people had a chance to see you and listen to you and get a sense of who you stood for and who you were fighting for.

In the course of a healthy debate, we prioritize different goals, and the different means of reaching them. But without some common baseline of facts, without a willingness to admit new information and concede that your opponent might be making a fair point, and that science and reason matter - then we're going to keep talking past each other, and we'll make common ground and compromise impossible.

This week I've travelled more than 15,000 miles from America to China to Burma to Australia. I have no idea what time it is right now.

I refuse to condemn your generation and future generations to a planet that's beyond fixing.