I used to be a lot more afraid of climate change. Now I spend my time working, planning, trying to move forward.

Taking fear seriously is not easy. A lot of people's response to fear is "Don't worry so much, it's crazy." But some things absolutely deserve our fear, and climate change is first among them.

I used to be a lot more afraid of climate change. Now I spend my time working, planning, trying to move forward.

Online petitions are built around getting as many signatures as possible. But the experience of taking them and forgetting about them degrades the importance.

I think it's very important to invite and encourage people to talk about climate change who have a lay understanding. In general, there is a lot of confusion among climate activists about the role of science, that scientists should be social and political leaders of this movement.

Social movements throughout history take place in people's minds. If we got 5,000 Americans who were talking about climate change to their neighbors and to their coworkers, and talking about this pledge, that would change the political and social landscape so much more than if 5,000 people got arrested for protesting a pipeline.

I argue that I don't think it's a moral position to say that civilization is going to collapse, and that's okay. Because that would cause the deaths of billions of people. It's certainly not something I'm willing to accept.