This document provides summaries of four environmental lawsuits: 1) Amchem Products Inc v British Columbia concerned asbestos lawsuits filed in Texas that were blocked by a BC court's ruling on forum non-conveniens. 2) Compagnie Francaise de Navigation concerned a Louisiana quarantine law challenged for infringing on interstate commerce and foreign treaties. 3) PUD No. 1 of Jefferson County involved hydroelectric dam permitting and required stream flows to protect salmon under the Clean Water Act. 4) Scenic Hudson Preservation Conference established the right of environmental groups to participate in regulatory proceedings that may affect their special interests in aesthetics, conservation, and recreation.