Indur Goklany's paper (PDF) for Cato's Policy Analysis is excellent. He goes through, using the Stern Review and DEFRA's Fast Track Assessment as his sources, why even pessimistic accounts of the costs of climate change cannot find more than marginal harms within the foreseeable future. This builds into a case that humanity will actually be better off in the warmer but richer scenarios that were purported to be the worst-case scenarios by Stern and DEFRA's researchers than in a cooler but poorer world.
Goklany argues that adaptation to the specific problems that might be worsened by climate change, such as malaria, is the way forward. His study provides yet more support for the now reasonably well established three-pronged response to climate change; that such an approach is a better idea than aggresive attempts to curb emissions. Technological development, adaptation and resilient free-market institutions can all contribute to an effective response to global warming.