imate change will require considerable financial resources. The scale of financial requirements and the burden sharing will be one of the key questions in the upcoming climate change negotiations in Copenhagen at the end of 2009. However, the scientific basis on which such decisions could be made is currently rather weak. Numerous studies have addressed the finance of climate change in the past. All of these studies differ in methodology and their selection of GHG reduction targets, base years and time horizons. Some deal with total costs,