This casebook covers the fundamentals in environmental law, such as air pollution, water pollution, hazardous waste and toxic pollutant regulation, protection of endangered species, and the National Environmental Policy Act, without overloading the professor and student with exhaustive and unnecessary detail. It focuses with clarity on landmark cases and recent upheavals in environmental law and regulation.

The revised edition newly covers the Trump administration's reversals of Obama era regulations through executive orders and regulations. The climate change crisis is an essential focus throughout, from chapters on the National Environmental Policy Act to the Endangered Species Act. The new edition further covers the rise and demise of the Clean Power Plan, the reformulation of the definition of waters of the United States, the reevaluation of the Endangered Species Act, and the Supreme Court's opinion on critical habitat.