New Scientist: IT IS hard to prepare for a disaster, but harder still to prepare for a disaster that you can't identify. Yet that is the quandary facing many nations, which still don't know how climate change will affect them even though it is already happening. That means many communities must prepare for the unknown. We are running out of time to gather scientific evidence, says Koko Warner of the United Nations University (UNU) in Bonn, Germany. It is clear that climate change is happening, driven by human...