A single ruling from a judge appointed by President Joe Biden may end up halting oil and gas drilling in the Gulf of Mexico in December. Judge Deborah Boardman, the Biden-appointed district judge in the U.S. District Court for the District of Maryland, sidedwith suing environmentalists in August to vacate a key National Marine Fisheries Service (NMFS) environmental review — known as a biological opinion — underlying offshore drilling in the Gulf of Mexico. Unless the federal government manages to revise the biological opinion by Dec. 20, and barring intervention from a higher court or the Cong…