Summary

Joseph Tyree Sneed Thomas v. Peterson — Opinion of the Court

Congress has assigned to the agencies and to the Fish & Wildlife Service the responsibility for evaluation of the impact of agency actions on endangered species, and has prescribed procedures for such evaluation. Only by following the procedures can proper evaluations be made. It is not the responsibility of the plaintiffs to prove, nor the function of the courts to judge, the effect of a proposed action on an endangered species when proper procedures have not been followed.
Source: Wikisource

Joseph Tyree Sneed Thomas v. Peterson — Opinion of the Court

Only by selling timber can the bulk of the expense of building the road be recovered. Not to sell timber after building the road constitutes the "irrational" result that Trout Unlimited's standard is intended to avoid. Therefore, the cumulative environmental impacts of the road and the timber sales must be assessed before the road is approved.
The Forest Service argues that the sales are too uncertain and too far in the future for their impacts to be analyzed along with that of the road. This comes close to saying that building the road now is itself irrational.
Source: Wikisource

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