Reuters: Energy Secretary Stephen Chu said on Tuesday that setting exact targets for carbon dioxide emissions had led to an "over-obsession" with numbers, as the United States moved closer to overhauling its energy policy. The comment came less than a week after a congressional panel approved President Barack Obama’s landmark draft bill on climate change, bringing it closer to debate in Congress. "There was a great deal of discussion on the Kyoto targets, and I’m not really sure which …