" State Farm , 463 U.S. at 43, 103 S.Ct. 2856. "Given the highly technical issues involved," the EPA's listing decisions are entitled to "significant deference." Bradley Mining Co. v. EPA , 972 F.2d 1356, 1359 (D.C. Cir. 1992). But "our reviews of listing decisions" are not "of the rubber-stamp variety."