Most of what we think of as distinctively human has occurred in the last 10,000 years in the Holocene - a period in which the Earth was abnormally quiet.

People and countries have done an enormous amount of damage in their attempts to bring about the best possible world. Communism is an obvious example. But so is British imperialism, which was not grubby self-interest all the way down, but at least in part a sincere attempt on the part of people who felt they were superior to other people to magnanimously improve the lot of their inferiors.

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.

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

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.

Acts are right in virtue of the goodness of their consequences.

It's true that climate change is an unprecedented problem so it's not surprising that it's so difficult to address.