Reuters: South Korea pledged for the first time on Tuesday to set a 2020 emissions reduction target, as the OECD’s fastest-growing carbon polluter voluntarily joined richer nations in setting hard goals to roll back climate change. By committing itself to one of three options, all of which are relatively modest compared to the cut-backs pledged by developed economies, Seoul is establishing a precedent that might encourage much bigger emitters like China and India to agree to targets of their …