As the COP15 UN Climate Change Conference enters the second week, the Four Horsemen of the Apocalypse descend on Copenhagen. The four horses represent Death, Famine, War and Pestilence - severe and interrelated impacts of unchecked climate change. They are in Copenhagen to send an ominous reminder to world leaders of what is at stake if they do not take urgent climate action and agree to a fair, ambitious and legally binding deal.