Maarten van Aalst, leading climate specialist for the Red Cross and Red Crescent, speaks about how climate change will affect people and assets during the presentation of the Intergovernmental Panel on Climate Change (IPCC) report at a press conference at the European headquarters of the United Nations in Geneva, Switzerland, in this April 11, 2007 file photo. Top international climate scientists and disaster experts meeting in Africa had a sharp message Friday Nov. 18, 2011 for the world's political leaders: Get ready for more dangerous and "unprecedented extreme weather" caused by global warming. (AP Photo/Keystone, Salvatore Di Nolfi, File)
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