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.

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

I never liked anyone who didn't have a temper. If you don't have a temper, you don't have any passion.

We need to inject some old-fashioned American values and common-sense, practical thinking into our energy policy.

I thought Jeb Bush would have made a good president. He was on the board of my foundation. He's very conservative, much too conservative for me.

I'd be derelict in my duty if I didn't go and continue to use every advantage that I can to promote New York's cause.

I never lie, so if somebody asked me a question, I told them.