Apocalypses don't happen very often. They tend to be separated by tens or even hundreds of millions of years.

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.

If you're interested in doing something about climate change as we all should be, all of us who care about future people and creatures that will inhabit this world. Then buying a Prius is a good thing but an even better thing would be to be on the streets demanding urgent action from the United States' Congress.

In trying to develop an impartial, expansive ethic we are trying to get ethical systems to do something which they did not evolve in order to do. This doesn't mean that it can't be done or that we shouldn't try to expand the reach of our ethical frameworks, only that there are reasons to be skeptical about its success.

In much of the world today there are no more chilling words than "I'm from the United States and I'm here to help you."

It's possible that we'll screw up the climate so badly that most of us will die and a few breeding pairs will remain somewhere in the arctic. What's more likely is that we'll continue remaking the planet, driving many species to extinction, killing millions of people through the indirect effects of climate change, making life even harder for the poor and powerless than it is now, and making it a little more difficult for the global middle class to live the lives to which they have become accustomed - in other words, business as usual, only worse.

Climate change involves fundamental choices about how we want to live and what kind of world we want.