I like the theater, dining and chasing women. Let me put it this way: I am a single, straight billionaire in Manhattan. It's like a wet dream.

Look, we live in a very dangerous world. We know there are people who want to take away our freedoms. New Yorkers probably know that as much if not more than anybody else after the terrible tragedy of 9/11.

I'd love to have a president who really was out there leading and traveling around the world campaigning for joint climate change action. Even the Chinese government is trying to get people to stop polluting. And I think the federal government level in China is acting more responsibly than the American government.

You must first be willing to fail — and you must have the courage to go for it anyway.

Fifty percent of the world's population lives in cities. In a couple of decades, 70 percent of the world's population will be living in cities. Cities are where the problem is. Cities are where the solution is, where creativity exists to address the challenges and where they have most impact. This is why, in 2005, the C40 was founded, an organization of cities that address climate change. It started with 18 cities; now it's 91. Cities simply are the key to saving the planet.

Donald Trump says he wants to run America like he's running his business? God help us.

I was a Democrat before I was a Republican before I became an independent and I never changed my principles.