By Alister Doyle, Environment Correspondent OSLO (Reuters) - World powers are running out of time to slash their use of high-polluting fossil fuels and stay below agreed limits on global warming, a draft U.N. study to be approved this week shows. It says nations will have to impose drastic curbs on their still rising greenhouse gas emissions to keep a promise made by almost 200 countries in 2010 to limit global warming to less than 2 degrees Celsius (3.6 Fahrenheit) over pre-industrial times. Temperatures have already risen by about 0.8 C (1.4F) since 1900 and are set to breach the 2 C ceiling on current trends in coming decades, U.N. reports show. "The window is shutting very rapidly on the 2 degrees target," said Johan Rockstrom, head of the Stockholm Resilience Centre, and an expert on risks to the planet from heatwaves, floods, droughts and rising seas.
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