Reuters: Rich nations have converged on targets of around 15 percent for cutting greenhouse gases by 2020, but recession across much of the world could impede efforts to agree a new U.N. climate pact by the end of the year. Cuts of 15 percent from current levels would fall far short of reductions advised by U.N.-backed scientists, but the recession is limiting government ambitions, analysts say. “We’re beginning to see a rough alignment for the numbers for developed countries,” said …