A leaked draft of a new United Nations report on climate change says global warming has already arrived and is probably already causing harm -- and the heating trend could be irreversible, the Associated Press reported Tuesday. The news comes from the final draft of a 127-page synthesis report from the Nobel Prize-winning U.N. Intergovernmental Panel on Climate Change, which summarizes the results of its three gigantic documents released over the past year. The AP notes that there is little in this new report that wasn't already in the lengthier, more detailed versions, but the language is more stark and the report attempts to connect the different scientific disciplines studying problems caused by the burning of fossil fuels, such as coal, oil and gas.

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