I'm going to be flying around Australia and New Zealand this December and January to give a bunch of philosophy talks. A bunch of the airlines down there offer carbon offsets. It sounds good and I've been buying them. Is this the thing to do, or is there some weird counterintuitive reason that it's a bad idea? And of course I'd like cap and trade / a carbon tax / any politically feasible way of averting the planetary disaster where traditional crops fail in poor countries so lots of people die and the refugees flee to our Atlantises.