One of Sive's first lawsuits that gained public attention was
David Sive v. Louis Newman (1951). In this case, Sive argued that the owner of a car that is double-parked is liable for damage incurred to a car traveling from the curb to the normal traffic stream. The argument was upheld. As a partner in the firm Winer, Neuberger & Sive, founded in New York City in 1962, and chairman of the Atlantic Chapter of the
Sierra Club in the 1960s, Sive developed his reputation as an expert litigator and fierce defender of the environment. The successor firm, Sive, Paget & Riesel, remains a leader in
environmental law. 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. == Academic experience ==