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.

We seem to have trouble with [critical thinking]. And our political system doesn't help.

We can have reasonable, thoughtful gun control measure that I think respect the Second Amendment and people's traditions.

Here's the truth: even if countries like the United States curb our emissions, if growing countries like India - with soaring energy needs - don't also embrace cleaner fuels, then we don't stand a chance against climate change.

I will never forget that the only reason I'm standing here today is because somebody, somewhere stood up for me when it was risky. Stood up when it was hard. Stood up when it wasn't popular. And because that somebody stood up, a few more stood up. And then a few thousand stood up. And then a few million stood up. And standing up, with courage and clear purpose, they somehow managed to change the world.

Generally speaking, people who know me will tell you that my public persona is not that different from my private persona.

In the end, that's what this election is about. Do we participate in a politics of cynicism or a politics of hope?