may render a case moot at any time. Counsel has an obligation to inform the court promptly of any such events. But wholly apart from the inexplicable and irresponsible delay in notifying us that the bankruptcy petition had been dismissed, we decline to address mootness now. Doing so would require us to violate the Supreme Court’s direction that, “[o]n every writ of error or appeal, the first and fundamental question is that of jurisdiction, first, of this court, and then of the court from which the record comes.” Bender v. Williamsport Area Sch. Dist., 475 U.S. 534, 547, 106 S.Ct. 1326, 89 L.Ed.2d 501 (1986) (quoting Mansfield C. & L.M.R. Co. v. Swan, 111 U.S. 379, 382, 4 S.Ct. 510, 28 L.Ed. 462 (1884)); see also Sierra Club v. U.S. Dep’t of Agric., 716 F.3d 653, 660 (D.C.Cir.2013) (<HOLDING>); Amalgamated Clothing & Textile Workers Union
holding that appeals are moot when appellate courts can provide no effective relief holding that consideration of a moot case was not required when there was no award of attorneys fees that would be affected by appellate review and the issue has not been preserved for appeal holding that where the issue of sanctions was not before the court of appeals when the appeal was filed the district court retained jurisdiction holding that because appellate jurisdiction was lacking the court can express no position on  whether the sierra clubs case was moot when filed holding that district court appropriately dismissed suit for lack of subject matter jurisdiction when the case was moot