<p><em>“In our scientific endeavours, we will never be able to achieve absolute certainty; however, we need to take actions also on the basis of imperfect knowledge.”</em> <a href="/node/180" target="_blank">IASS Executive Director Klaus Töpfer</a> referred in his opening statement to the workshop “Disentangling Climate Curiosities – If Climate Cannot Make Up Its Minds, How Can We Make Up Ours?”, held at the IASS on 9 April, 2014, to this well-known situation in which policy-makers have to make decisions.</p>