In the early 1970s, federal and state officials anticipated major coal development in the Northern Great Plains region (including parts of Montana, Wyoming, North Dakota, and South Dakota), spurred by national energy demands. Various federal agencies—most prominently the Department of the Interior—were considering or acting on discrete approvals such as coal leases, mining plans, power plant siting, and rights-of-way. The Sierra Club sued the Secretary of the Interior (Thomas S. Kleppe), seeking to compel a single, comprehensive, region-wide environmental impact statement (EIS) under NEPA before the government took further steps that would facilitate coal development in the region. The Sierra Club contended that the cumulative and synergistic environmental effects (on air quality, water resources, wildlife, and regional land use) could not be adequately captured through piecemeal, project-by-project EISs and instead required a programmatic EIS for the region as a whole. While certain project-specific EISs existed or were being prepared, there was no formal, adopted federal regional development plan for the Northern Great Plains. The district court rejected the Sierra Club's broad demand; the D.C. Circuit reversed and directed that a programmatic EIS be prepared. The Supreme Court granted certiorari.
Under NEPA, must the federal government prepare a single, comprehensive (programmatic) EIS for anticipated coal development across the Northern Great Plains absent a concrete, proposed federal regional development plan, or can environmental review proceed through project-specific EISs unless and until related proposals are pending concurrently and require integrated analysis?
NEPA requires an environmental impact statement for proposals for major Federal actions significantly affecting the quality of the human environment. The obligation to prepare an EIS is tied to the existence of a concrete proposal, not to abstract plans or general policy considerations. Agencies must consider in a single EIS related proposals that are sufficiently connected or concurrently pending and that have cumulative or synergistic environmental impacts. The determination of whether a proposal exists and the appropriate scope of an EIS are committed, in the first instance, to the responsible agency, subject to judicial review under the Administrative Procedure Act's arbitrary-and-capricious standard and guided by the Council on Environmental Quality (CEQ) guidelines.
No programmatic, region-wide EIS was required because the federal government had not proposed a comprehensive regional development plan for the Northern Great Plains. NEPA does not compel the preparation of a regional EIS based solely on anticipated cumulative development. However, when multiple related proposals with cumulative or synergistic impacts are pending concurrently, agencies must consider them together in an appropriate EIS.
The Court emphasized that NEPA's text requires an EIS for proposals for major Federal actions. The touchstone is the existence of a concrete, formulated proposal—not the mere contemplation or likelihood of future development. Here, there was no formal federal proposal for a comprehensive Northern Great Plains regional coal development program; rather, there were multiple discrete actions at varying stages of decision-making, many of which were state or private initiatives or involved different federal entities. Requiring a region-wide EIS in the absence of a federal proposal would decouple NEPA review from actual decision-making and force agencies to speculate about hypothetical future actions, contrary to NEPA's procedural design. At the same time, the Court underscored that NEPA does not permit agencies to evade meaningful review through fragmentation. When multiple related proposals are sufficiently connected or pending concurrently and would create cumulative or synergistic environmental effects, their impacts must be considered together in a single EIS. The Court gave substantial weight to CEQ's guidelines in articulating this cumulative-impacts principle. However, deciding whether and when proposals are sufficiently concrete and related to require a single EIS is primarily an agency judgment, reviewable under the arbitrary-and-capricious standard. Because the Secretary had not advanced a regional proposal, and because the record did not show concurrently pending federal proposals that collectively demanded a single EIS for the whole region, the D.C. Circuit erred in compelling a programmatic EIS.
Kleppe is the leading case on programmatic EISs. It clarifies that (1) NEPA's EIS duty attaches to concrete proposals for major federal action; (2) absent a formal proposal, courts should not compel a speculative, region-wide EIS; and (3) agencies must still address cumulative and synergistic impacts where multiple related proposals are pending together. The case also reinforces deference to agency judgments about the scope and timing of NEPA review, grounded in CEQ guidance and policed by arbitrary-and-capricious review. Practically, it delineates the boundary between premature 'big-picture' review and improper segmentation, shaping how agencies structure environmental analyses and how litigants frame NEPA challenges.
Kleppe v. Sierra Club aligns NEPA's procedural obligations with concrete agency decision-making. By insisting that an EIS obligation arises only when there is an actual proposal for major federal action, the Court prevented courts from compelling speculative, overly broad analyses untethered to imminent decisions, while preserving the duty to analyze cumulative impacts when proposals are sufficiently connected or concurrent.