The world is warming far more quickly than scientists forecast just two years ago when the Intergovernmental Panel on Climate Change published its last reports, according to a series of assessments presented over the weekend.

Chris Field of Stanford University, a senior member of the IPCC, told the annual meeting of the American Association for the Advancement of Science that the unexpectedly rapid increase in the burning of fossil fuels, especially coal, since 2000 would have dire consequences because of "feedback loops" in the global -climate.