Delhi is locked in a complete choking smog at the moment - they've had to close schools in one of the world's biggest cities. They have their own reasons for needing to get off fossil fuels fast.

There is no real scientific debate over what is happening; of course there is debate over exactly how it is going to play out in the decades ahead, because this is a large experiment that we haven't done before, and no one knows precisely how one can ever precisely predict what effects this heat will have. But all the science in the last few years, or almost all of it, really serves to show that the effects are larger and more rapid than we had thought even a decade ago.

The religious environmental movement is potentially key to dealing with the greatest problem humans have ever faced, and it has never been captured with more breadth and force than in RENEWAL. I hope this movie is screened in church basements and synagogue social halls across the country, and that it moves many more people of faith off the fence and into action.

The real negotiation is between humans on the one hand and chemistry and physics on the other. And chemistry and physics, unfortunately, don't bargain.

There is no ideal Christmas; only the one Christmas you decide to make as a reflection of your values, desires, affections, traditions.

The ability to write compelling emails may be the single most useful talent an organizer can possess.

Climate change is the single biggest thing that humans have ever done on this planet. The one thing that needs to be bigger is our movement to stop it.