There are many things we can choose to do about climate change, including doing nothing at all. All of them have consequences, many of which will be unforeseen. If we could foretell more accurately what would happen to the climate in the future, our choices might be clearer, if not necessarily easier to make. Unfortunately, predicting future climate change is fraught with uncertainty, and we will be forced to make choices in the face of that uncertainty. To what extent are w