A Rhode Island-based environmental group asked a federal court to freeze work on the Revolution Wind project, saying the plans require a new biological opinion on potential effects on endangered sei and fin whales. Green Oceans filed its original lawsuit in January challenging the southern New England offshore wind project. On April 18 the group’s lawyers were back at U.S. District Court Judge Royce C. Lamberth’s court in Washington, D.C., with a motion to stay all permits and approvals for the project.