As someone fond of describing myself as classical liberal, I have always been surprised by my instinctive opposition to global warming, emissions trading and the like. Socialists welcome limits on emissions, as these imply limits on economic growth and bring back re-distribution on the agenda. For a liberal, economic growth and free trade should be able to achieve all the re-distribution that is needed, so any limits on either are instinctively opposed.
In a perceptive article in the FT, Martin Wolf describes this conflict. (Might need registration).