427 U.S. 390 96 S.Ct. 2718 49 L.Ed.2d 576 Thomas S. KLEPPE, Secretary of the Interior, et al., Petitioners,v.SIERRA CLUB et al. AMERICAN ELECTRIC POWER SYSTEM et al., Petitioners, v. SIERRA CLUB et al. Nos. 75-552 and 75-561. Argued April 28, 1976. Decided June 28, 1976. Syllabus Section 102(2)(C) of the National Environmental Policy Act […]