OSLO (Reuters) - Governments may have to extract vast amounts of greenhouse gases from the air by 2100 to achieve a target for limiting global warming, backed by trillion-dollar shifts towards clean energy, a draft U.N. report showed on Wednesday.
A 29-page summary for policymakers, seen by Reuters, says most scenarios show that rising world emissions will have to plunge by 40 to 70 percent between 2010 and 2050 to give a good chance of restricting warming to U.N. targets.
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