Sometimes, history sneaks up on you. And sometimes you know it's coming.

I was always very detail-oriented, and in the time I spent in different roles - the elected official, the campaign manager - I had a tendency to want to push the creation of the product and really work on the critical path that would get to product.

Clearly, Mayor Bloomberg did some things right. I think he did a very good job on public health. He did a very good job on environment. I think he was right to achieve mayoral control of education. I don't think he then applied it the right way.

Excessive stop-and-frisk divides communities. That's why the New York City Police Department has moved away from it.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

We have an obligation to our men and women in uniform - and to future generations - to do something about the issue of climate change.

Food choices are something fundamental you can control about yourself: what you take into your body. When so many other things are out of control and your influence over climate change - all these much larger issues - it's very hard to see any results or any progress. But everybody can see progress around food.

COP 21 provides a unique opportunity for the political leaders of this generation to provide lasting foundations for the preservation and sustainability of generations of the future.