A three-judge D.C. Circuit panel is grappling with numerous key issues in the Biden EPA’s high-profile power plant greenhouse gas standards, with oral arguments offering hints about where they see vulnerabilities in a measure that has been a chief target for rollback by the incoming Trump administration. The judges’ comments during Dec. 6 oral argument in the case, West Virginia, et al. v. EPA, et al. , could have implications for future power plant GHG rulemakings, even as the panel...