The scientific evidence of how serious this climate crisis is becoming continues to amass week after week after week.

I'm naturally an optimist, but my basis for hope is rooted in my understanding of human nature.

I take no pleasure in the fact that the scientific predictions I’ve relayed to popular audiences turn out to be true.

At some point, a false belief collides with physical reality.

Having cameras follow you is something that requires a little personal adjustment, but you actually do begin to forget they're there. It's impossible to maintain that awareness all the time, and when you're going through an emotional or absorbing experience, you really don't have any spare attention to think, "Got to remember that the camera is rolling."

Global warming, along with the cutting and burning of forests and other critical habitats, is causing the loss of living species at a level comparable to the extinction event that wiped out the dinosaurs 65 million years ago. That event was believed to have been caused by a giant asteroid. This time it is not an asteroid colliding with the Earth and wreaking havoc: it is us.

The struggle against poverty in the world and the challenge of cutting wealthy country emissions all has a single, very simple solution... Here it is: Put a price on carbon.