Environmental problems provoke challenges about what kind of world we want, how important we think it is if something is brought about by human action or by brute nature, what we think of the value of human life compared to that of other living things.

I played with English and Sociology in college but dropped out to work in the anti-war movement. I was going around denouncing the Viet Nam war as immoral but one day it dawned on me that I didn't know what that meant. I signed up for an ethics class at San Francisco State to find out the answer.

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.

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.

Philosophers tend to radically underestimate the distance between abstract principles (such as "reduce suffering") and what it might actually mean for people to act on them.

I think that by the middle of this century people will still be eating meat (though less), and their meat will mostly be produced in factories through synthetic processes, cell cultures, and so on.

Philosophy is not a body of knowledge to impart to someone, that's why reading philosophy books isn't always the best way of learning philosophy. Philosophy is really more the process of rational engagement, rational reflection with a diversity of views and ideas and opinions and trying to sort of reason your way through to a more reflective position. I think if you look at it that way, philosophizing is to some extent some small way a part of almost everyone's lives although they don't recognize it as such and a lot of people are embarrassed about it.