Even if Bill McKibben were to become dictator, future generations would suffer because of the carbon we had already emitted.

I must say that in my own mind, I think what's important is for us, as a society, to radically reduce the consumption of meat. This is more important than some fraction of us become moral saints and become vegetarians so it would be much better if we would reduce meat consumption by three quarters of each of us as an individuals would only eat one-quarter as much meat as we do now then that half of the population should become vegetarian. We should see this as a collective challenge rather than an issue about individual, moral period.

We need to use economic instruments such as carbon taxes, cap and trade, tax and dividend and whatever else to help incentivize behavior that will move us to a post-carbon, post-animal agriculture world, and make our societies more resilient to the shocks that are already baked into the system. But that doesn't make climate change an "economic issue."

The idea that Bentham and Mill were maximizers is the greatest stretch of all. They were progressivists, committed to improving the societies in which they lived, not utopian maximizers.

Attitudes are changing very quickly.

None of us are rational economic men as we're supposed to be portrayed in economic theory where mixes of passions, of desires, of moral principles, of self-deception, of altruism, of concern of others, of concerns for ourselves and an interest in our bank accounts. And social policies have to be responsive to the complexity of who we are as people or else, like the war on drugs, they're simply going to fail.

Climate change involves behaviors that are individually negligible, whose impacts go far beyond the spatial and temporal constraints that define our sense of community.