172
Opinion of the Court
that the Biological Opinion implicitly determines critical habitat without complying with the mandate of § 1533(b)(2) that the Secretary "tak[e] into consideration the economic impact, and any other relevant impact, of specifying any particular area as critical habitat." This claim does come within subsection (C).
The Government seeks to avoid this result by appealing to the limitation in subsection (C) that the duty sought to be enforced not be "discretionary with the Secretary." But the terms of § 1533(b)(2) are plainly those of obligation rather than discretion: "The Secretary shall designate critical habitat, and make revisions thereto, . . . on the basis of the best scientific data available and after taking into consideration the economic impact, and any other relevant impact, of specifying any particular area as critical habitat." (Emphasis added.) It is true that this is followed by the statement that, except where extinction of the species is at issue, "[t]he Secretary may exclude any area from critical habitat if he determines that the benefits of such exclusion outweigh the benefits of specifying such area as part of the critical habitat." Ibid. (emphasis added). However, the fact that the Secretary's ultimate decision is reviewable only for abuse of discretion does not alter the categorical requirement that, in arriving at his decision, he "tak[e] into consideration the economic impact, and any other relevant impact," and use "the best scientific data available." Ibid. It is rudimentary administrative law that discretion as to the substance of the ultimate decision does not confer discretion to ignore the required procedures of decisionmaking. See SEC v. Chenery Corp., 318 U. S. 80, 94-95 (1943). Since it is the omission of these required procedures that petitioners complain of, their § 1533 claim is reviewable under § 1540(g)(1)(C).
2
Having concluded that petitioners' § 1536 claims are not reviewable under subsection (C), we are left with the ques-
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