This Concise Hornbook is a comprehensive yet concise user-friendly treatise on important natural resources law issues. It surveys cases, statutes, regulations, legal developments, and policies that have shaped, and will continue to influence, natural resources law throughout the 20th century and the early 21st century. Topics include resource economics, jurisdictional constraints, the National Environment Policy Act (NEPA), wildlife, public lands, preservation, recreation, rangeland, timber, mining, and energy. The 2nd edition provides expanded treatment of climate-related issues and a new chapter on renewable energy law, and it updates the changes in natural resources policy instigated by the Trump Administration since 2017.