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Time running out to reach 2 C warming target: UN experts
Earth is now on a trajectory for at least 4 C warming by 2100 over pre-industrial times - a recipe for worsening drought, flood, rising seas and species extinctions. "The scientific case for prioritising action on climate change is clearer than ever," IPCC chief Rajendra Pachauri said. The report - the first overview by the Nobel-winning organisation since 2007 - comes ahead of talks in Lima next month to pave the way to a 2015 global pact in Paris to limit warming to 2 C. But the negotiations have been hung up for years over which countries should shoulder the cost for reducing carbon emissions, which derive mainly from oil, gas and coal - the backbone of the world's energy supply today. The report said switching to cleaner sources, reducing energy efficiency and carrying out other emission-mitigating measures would be far cheaper than the cost of climate damage. "Mitigation cost estimates vary, but global economic growth would not be strongly affected," the IPCC said, estimating that "Ambitious" carbon curbs would shaving 0.06 percentage points annually from global consumption this century, which is targeted to grow by 1.6-3.0 percent annually. "Compared to the imminent risk of irreversible climate change impacts, the risks of mitigation are manageable" said Youba Sokona, one of the lead authors of the new report. The report is only the fifth in the IPCC's 26-year history. Sunday's synthesis report encapsulated three previous volumes published over the last 13 months.

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