Sive lost one of the earliest cases under the National Environmental Policy Act, "Concerned About Trident v. Schlesinger", 400 F.Supp. 454 (D.D.C. 1975). Among the many landmark cases Sive argued were "Scenic Hudson Preservation Conference v. Federal Power Commission" (1971). The "Storm King" case accorded standing to a citizens group without financial interest in the proposed power project and ordered the defendant to explore alternatives. Con Ed eventually abandoned the project. Other notable cases included "Committee for Nuclear Responsibility, Inc. v. Schlesinger" (1971), argued before the U.S. Supreme Court, which attracted wide media attention to the issue of governmental underground nuclear bomb testing and its potential environmental effects at Amchitka Island, Alaska; "Concerned About Trident, Inc. v. Rumsfeld" (1976), which established that strategic military decisions are not exempt from compliance with the National Environmental Policy Act; "Mohonk Trust v. Board of Assessors of Town of Gardiner" (1979), a real property case that on appeal established that land owned by a trust for environmental preservation and use could be exempt from real property taxes; "Citizens Committee for the Hudson River v. Volpe et al." (1970), which stopped the construction of a proposed expressway on fill to be placed in the Hudson River.