The Obama administration hasn’t even issued its planned regulations to curb carbon emissions yet, but that hasn’t stopped the U.S. Chamber of Commerce and the Environmental Protection Agency from engaging in a public spat over whether or how much the potential rules could harm the nation’s economy. On June 2, 2014, President Barack Obama’s EPA is expected to unveil significant new regulations on existing coal and natural gas plants as part of the administration’s ongoing efforts to fight climate change.