If you look at who starts new businesses, people that are innovative and risk takers. When you look at immigrants, you really have to be an innovator and a risk taker to leave everything you know in the old country and go to a new country. People that come here in America come here to work.

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.

We all must recognize that homeland security funds should be allocated by threat and no other reason.

We are the safest large city in America, but any crime rate is too high.

Our goal here in New York is to ensure that every child who graduates high school is ready to start a career or start college and to dramatically increase the number of students that graduate from college.

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

We've continued progress in the six months since Trump got elected, and the good thing about what we're doing is that success begets success. As we bring down greenhouse gases, for example, we've closed half of the coal-fired power plants in the country in recent years. There's more impetus to try to close the other half because you can see that it is working. So, you know, I had hoped that Trump would not do that, and it doesn't make any sense to me, but regardless, it is not as cataclysmic as it could be.