Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination.

I flew on Air Force Two for eight years, and now I have to take off my shoes to get on an aeroplane.

The carbon fuels industry-big oil and coal-have a 50-year lease on the Republican Party and they are drilling it for everything it's worth.

When fear displaces reason, the result is often irrational hatred and division.

There are people who say, "God is in complete control of everything that happens, and if the Earth is getting warmer, then maybe God intends that." Well, no. God intends for us to take responsibility for how we treat God's creation, and if we choose to use the thin shell of atmosphere surrounding our planet as an open sewer for 110-million tons of global-warming pollution every day, the consequences are attributable to us. And if you are a believer, as I am, I think God intends for us to open our eyes and take responsibility for the moral consequences of our actions.

It's a blessing to have work that feels fulfilling.

A zebra does not change its spots.