I've been involved in the intelligence side of the federal government for a long time. We all know that we have to have a balance between security to protect the American people and liberty. We take an oath to protect and defend the constitution and the American people.

I've always viewed the Paris Agreement as a starting point. If you look at all the commitments that have been made by all the countries, it's still not sufficient to deal with the very dangerous situation we face. What it has done is that it created an architecture whereby as technology improves, as we find new clean sources of energy, as we make our economies more efficient, then gradually we can turn up the dial and improve the outcomes of Paris.

When I was a kid, I inhaled. Frequently. That was the point.

These are young people who made mistakes that aren't that different than the mistakes I made and the mistakes that a lot of you guys made, we have a tendency sometimes to almost take for granted or think it's normal that so many young people end up in our criminal justice system. It's not normal. ... What is normal is teenagers doing stupid things.

There are folks who will equivocate. They'll say, 'You know, I'm not a scientist.' Well, I'm not either. But the best scientists in the world know that climate change is happening.

I think I was able to talk to people about values in ways that people - in ways that resonated with folks.

If we're going to prevent large parts of this Earth from becoming not only inhospitable but uninhabitable in our lifetimes, we're going to have to keep some fossil fuels in the ground rather than burn them and release more dangerous pollution into the sky.