Despite a unanimous vote by a citizen’s air pollution board earlier this month, Virginia faces several hurdles, including possible court and legislative challenges, before it could join a regional carbon emissions trading network. “The biggest threat,” said Will Cleveland of the Southern Environmental Law Center, is “legislation in the General Assembly attacking or rolling back DEQ’s (Department of Environmental Quality) authority to address carbon pollution or some sort of budgetary maneuver to defund DEQ’s efforts.”“In court,” Cleveland added, “I’d anticipate litigation similar to (opponents’) challenges to the Clean Power Plan, attacking DEQ’s authority to regulate carbon.”The DEQ is the agency coordinating Virginia’s bid to link up with the Regional Greenhouse Gas Initiative, or RGGI, by early 2019.State Sen. Frank Wagner, who chairs the committee that presides over energy legislation in that chamber, has promised to bring in “all of the key players” with a “barrage of questions about the legality” of Gov. Terry McAuliffe’s executive directive to link up with RGGI as a state-based replacement for the Clean Power Plan.