Summary

Walter Roe Mansfield Hanly v. Kleindienst — Opinion of the Court (1972)

We agree with Chief Judge Friendly that an impact statement should not be required where the impact will be minor or unimportant, or where “there is no sensible reason for making one,” and that such a statement should be required where the action may fairly be said to have a potentially significant adverse effect. But these conclusions merely pose the problem which cannot be solved by an interchange of adjectives. In our view such a morass can be avoided only by formulation of more precise factors that must be considered in making the essential threshold determination.
Source: Wikisource

Walter Roe Mansfield Hanly v. Kleindienst — Opinion of the Court (1972)

It is equally clear that an action which is environmentally important to one neighbor may be of no consequence to another. Congress could have decided that every major federal action must therefore be the subject of a detailed impact statement prepared according to the procedure prescribed by § 102 (2) (C) . By adding the word “significantly,” however, it demonstrated that before the agency in charge triggered that procedure, it should conclude that a greater environmental impact would result than from “any major federal action.”
Source: Wikisource

Walter Roe Mansfield Hanly v. Kleindienst — Opinion of the Court (1972)

Accordingly we conclude that the applicable scope of review of an agency's threshold determination that an impact statement is not required under § 102 of NEPA is the “arbitrary, capricious, abuse of discretion” standard. See, e. g., Echo Park Residents Committee v. Romney, 3 E.R.C. 1255 (C.D.Calif. 1971) .
Upon attempting, according to the foregoing standard, to interpret the amorphous term “significantly,” as it is used in § 102 (2) (C) , we are faced with the fact that almost every major federal action, no matter how limited in scope, has some adverse effect on the human environment.
Source: Wikisource

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