The Supreme Court case Kleppe v. Sierra Club revolved around the issue of environmental impact statements and their necessity in federal projects. The Sierra Club, along with other environmental groups, argued that the Bureau of Land Management (BLM) was required to prepare a comprehensive environmental impact statement for vast coal reserves in four western states before leasing any part of them for mining purposes. They claimed that BLM's piecemeal approach violated the National Environmental Policy Act (NEPA). However, Secretary of Interior Thomas S. Kleppe contended that an overall regional or basin-wide statement was not necessary under NEPA until specific development proposals were made and approved. In 1975, the U.S Supreme Court ruled in favor of Kleppe stating that NEPA does not require a comprehensive impact statement when there are no proposed actions pending which could significantly affect environment quality; rather it requires such statements be prepared only for actual proposals which have been formulated with sufficient specificity to permit meaningful evaluation thereof by concerned public agencies and citizens.

In the dissenting opinion for Kleppe v. Sierra Club, Justice Douglas argued that the majority's decision to uphold a broad interpretation of federal power over public lands was misguided and potentially harmful. He contended that this expansive view of federal authority could lead to unchecked development and exploitation of natural resources, without sufficient consideration for environmental impacts or state rights. Furthermore, he criticized the majority's reliance on an overly narrow reading of NEPA (National Environmental Policy Act), which in his view should require comprehensive impact statements not just for individual projects but also cumulative effects from multiple related actions across a region. This broader approach would better serve NEPA’s purpose to promote sustainable use and preservation of our nation’s environment by ensuring all significant impacts are fully considered before decisions are made.