I’m about to go to Chicago for a conference on global warming and like environmental issues (part of the Chicago Festival of the Humanities). I’m appearing with Peter Singer and Chris Stone, with Dale Jamieson as chair. For me there will be some local cooling–going from Miami to Chicago. My thesis will be that the earth is intrinsically valuable, not merely valuable because it houses us. Therefore the earth can be harmed and its value compromised–say, by rendering it barren. I think the value of the earth depends upon three main factors: its physical beauty, seen from up close or from a distance; its ability to support life in all its forms; and its inherent interestingness (much more so than the moon, say). When we damage the earth we run the risk of destroying its value-conferring properties. So climate change is potentially bad not merely because it threatens the well-being of future humans but also because it right now offends against the earth’s intrinsic value.