After a year of protests and controversy, oil began flowing through the 1,200-mile Dakota Access pipeline earlier this month. But the pipeline’s ultimate fate is now uncertain after a federal judge issued a ruling on Wednesday that challenges parts of the environmental review completed before the pipeline was permitted. The pipeline can continue operating — for now. But it’s possible the D.C. District Court judge could soon shut it down. Lawyers must submit new arguments on whether the pipeline should continue transporting oil while a federal agency reconsiders parts of its environmental review.