Cities with clean air gain an economic advantage, because where people want to live and work, businesses want to invest.

There's a fascinating statistic: One out of every four people in America has visited New York since 9/11. It is astounding. Now, I don't know how you count it; it's some people coming multiple times.

The truth of the matter is: you can create a great legacy, and inspire others, by giving it to philanthropic organizations.

You know, Russia today is, what, 200 million people? In land mass, it's probably 50 times the size [of Japan], in natural resources a hundred times the size! Russia's not doing all that badly. The public there - not everybody - but they have things that the West offered, [that] were only available in the West a long time ago.

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 can't depend on polls.

Our climate is changing. And while the increase in extreme weather we have experienced in New York City and around the world may or may not be the result of it, the risk that it may be - given the devastation it is wreaking - should be enough to compel all elected leaders to take immediate action.