Rules: A bill encouraging the use of natural-gas-powered vehicles will give the EPA authority to regulate greenhouse gases while rewarding the Democratic left's patron saint. We like natural gas. It's the cleanest-burning fossil fuel, the U.S. has lots of it and, thanks to technologies such as hydraulic fracturing (aka "fracking"), we can get even more of it from the vast shale formations that dot the country. Others like it, too, which is why a bill floating through Congress, the New Alternative Transportation to Give Americans Solutions Act of 2011 (HR 1380), or Nat Gas Act, has seen a number of...