Years ago, after I'd answered several questions from a group of teens, one of them asked how I could stay optimistic and keep on going. I answered that instead of getting sad, I get mad.

We need to invest in clean energy technologies. We need to rush them to market while rebuilding our energy networks intelligently. And it's imperative that we push toward a cultural shift away from energy waste to respectful conservation with fierce commitment that will carry us to the other side.

Without information, there can be no real understanding of the ramifications of our choices.

Money and stuff aren't what makes us happy. It's strong connections within families and friends, communities of people that truly care about one another.

The imbalances in the climate have been brought on by the incessant push for more and more immediate wealth.

It's incredibly disturbing to me that humans are disrupting pretty much every single living system on the planet.

Being mad is activating. Being sad can lead to hopelessness. I'm not hopeless. I'm very hopeful.