Reuters: One day after President Barack Obama asked Congress to craft a law to cap carbon emissions, battle lines were drawn in Congress on Wednesday over how to deal with human-spurred climate change. Testimony at two congressional hearings was starkly divided between such experts as R.K. Pachauri of the U.N. Intergovernmental Panel on Climate Change, who called for quick action to curb emissions, and Princeton physicist William Happer, who said increased carbon dioxide emissions “will be …