June 27, 2012. The U.S. Environmental Protection Agency was "unambiguously correct" in moving to set limits on industrial and automotive emissions of greenhouse gases including carbon dioxide, a federal appeals court said. A three-judge panel of the U.S. Court of Appeals in Washington ruled that the EPA properly concluded that greenhouse gases are pollutants that endanger human health and that opponents don't have the legal right to challenge rules determining when states and industries must comply with regulations curtailing emissions of them.