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Global average temperatures will rise at least 4 degrees celsius by 2100 and potentially more than 8 degrees by 2200 if carbon dioxide emissions are not reduced, a new research has warned. Scientists found global climate is more sensitive to carbon dioxide than most previous estimates.The research also appears to solve one of the great unknowns of climate sensitivity, the role of cloud formation and whether this will have a positive or negative effect on global warming. "Our research has shown climate models indicating a low temperature response to a doubling of carbon dioxide from preindustrial times are not reproducing the correct processes that lead to cloud formation," said Professor Steven Sherwood, lead author from the University of New South Wales. "This new research takes away the lower end of climate sensitivity estimates, meaning that global average temperatures will increase by 3 to 5 degrees celsius with a doubling of carbon dioxide," said Sherwood.