Being an entrepreneur isn't really about starting a business. It's a way of looking at the world: seeing opportunity where others see obstacles, taking risks when others take refuge.

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

If I remember, Russia, 20 or 30 years ago, you'd get shot trying to leave. Today, Russian tourists are all over the world. You have Russian oligarchs with big yachts all over the world.

I've always thought if we don't want to enforce laws on the books, we should remove them from the books. But when you have laws, you breed contempt if you don't enforce them.

Five years have come, and five years have gone, and still we stand together as one. We come back to this place to remember the heartbreaking anniversary - and each person who died here - those known and unknown to us, whose absence is always with us.

Other ways of looking at the environmental or climate change stuff is to frame it in the context that it is simultaneously a public health issue. One out of eight premature deaths worldwide happens because of air pollution. The worst power plant in America kills 278 people a year and causes 445 heart attacks. So, when we improve air quality we improve our lives, and at the same time we improve the climate as well. We must see climate policy from this perspective and not as an abstract threat that may threaten our survival in 100 years.

When I came into office, people said, 'Billionaire? How do they live? What do they eat? How do they sleep?' Today, they see me on the subway coming uptown. A couple of people say hi, some people smile and nod. Some people just sleep. It's not an issue.