When it approved a two-mile gas pipeline expansion in 2019, the Federal Energy Regulatory Commission said it couldnât predict that projectâs potential effects on gas consumption or production emissions. A three-judge panel is considering whether the commission had an obligation to do more after it heard opening arguments Friday in a case brought by Berkshire Environmental Action Team and Washington-based nonprofit Food & Water Watch. The U.S. Court of Appeals for the District of Columbia Circuit streamed the opening arguments on its YouTube page, where the video remains available. Although the expansion has already been built, the plaintiffs want the court to vacate the FERCâs permit for the project, putting in question its legal ability to run until the FERC conducts further study.