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Report on ocean current changes suggests that northern Europe is set to cool as warm water circulating to the far north reduces significantly. New computer model of next century's rainfall predicts a 30% drop in the Sahel region of Africa. UN Summit on Climate Change takes place in Montreal. Data from the Huygens lander reveals the surface of Titan has channels cut by methane rain, is sprinked with with ice boulders and has a crust of carbon-rich chemicals. Researchers join forces to hunt for gravitational waves. Plus, the accidental discovery traces of a six-legged giant in Scotland.