Reuters: The cost of efforts to avoid dangerous global warming may be 170 percent higher than 2007 estimates, a report for the U.N.’s climate agency said on Thursday. The report comes four days before the U.N. leads a fresh round of talks in Poland to agree a successor to the Kyoto Protocol in ongoing negotiations marred by squabbles over who should bear the cost of fighting climate change. The U.N. report cited research by the International Energy Agency (IEA), energy adviser to 28 …