The meeting was chaired by Ch. Langenberger and focussed on the uncertainties of climate models and the political and economical consequences. Christoph Schär discussed the strengths and weaknesses of the current climate models. Do we have enough time to wait on the next generation of models, knowing that they will leave open questions as well? He concludes that it is necessary to cautiously act despite of remaining uncertainties. Heidi Schelbert-Syfrig illustrates how economists often decide based on incomplete knowledge. Economical theories provide the following surprising result for climate politics: the larger the uncertainties about climate change are, the quicker one has to act to minimize the potential damage.