Book excerpt: Mountains are the home of significant ecological resources - wildlife habitat, higher elevation plant systems, steep slopes, delicate soils and water systems. These resources are subject to very visible and growing pressures, most of which are caused by the unique features of mountains. Using as case studies four mountain resorts in the US and Canada, this book analyzes the extent to which the law protects the ecological systems of mountains from the adverse impacts associated with the development, operation and expansion of resorts. In order to examine these issues, Mountain Resorts takes an interdisciplinary approach, with contributions from ecologists and lawyers who focus on ski-related activities, increasing four-season use of the mountains and expanding residential, commercial and recreational development at the mountains' base. Its analysis of an array of US and Canadian federal, state and local laws provides a multifaceted exploration of the intersection of ecology and the law at mountain resorts.