Our traditional systems of decision-making are just not up to preventing changes in fundamental earth systems that are driven by a constant barrage of individually negligible emissions of an invisible, odorless gas, by billions of people all over the world.

Many environmental questions are in a deep way philosophical, despite our penchant for treating them as if they were only technological, economic, or whatever.

I think the challenge of climate change in particular is the challenge for us to create and produce new norms for a new kind of world. And that's why I think as important as the issue of climate change is, it's even more important than it seems because if we can't evolve very quickly, new norms to deal with issues like climate change, we're not going to be able to survive in the kind of world we've created. So I think, really, the whole nature of democracy, of governance, of global community and of solving the kinds of problems of the 21st Century are really at stake.

Philosophy isn't reading Emmanuel Kant. Philosophy is about thinking hard about what the right thing to do is in a situation and approaching that kind of question in an open-minded and open-hearted way, receptive to a broad range of considerations and interests of other people and other things.

The erosion of agency has consequences for our politics. As a result of all this, the fundamental ethical challenge of the anthropocene is the recovery of agency, or alternatively to come to terms with its loss and to understand how to go on.

People with long memories and a vivid sense of the past have an immediate understanding of politicians like Donald Trump. They are not surprised by the behavior of Google, a corporation that notionally (until recently anyway) espoused the slogan "don't be evil" and then runs over individual people and even entire nations in the pursuit of profit.

A great deal of our math, science, philosophy, and everyday behavior presupposes that stability and equilibria are the "default" states, and everything else involves some "perturbation." This is a mental model, a conceptual frame, a tacit belief, a presupposition - whatever you want to call it.