The U.S. Supreme Court’s opinion in Weyerhaeuser Co. v. U.S. Fish & Wildlife Service raises important questions about the scope of the Endangered Species Act’s (ESA’s) protections for critical habitat. Foremost among them is a question one might think was long settled: what is “habitat”? In a short ruling, the Weyerhaeuser Court opined that “critical habitat” must first be “habitat,” but it did not attempt to define exactly what habitat is or how much deference the U.S. Fish and Wildlife Service should get on what is both a biological and policy question.

This Article, adapted from Chapter 16 of What Can Animal Law Learn From Environmental Law?, 2d Edition (ELI Press, forthcoming 2020), explores existing and potential wildlife conservation policies that could play a vital role in mitigating global climate change. It describes how climate change is impacting wildlife and biodiversity around the globe and reviews the history and current state of U.S. policy, including how the federal government currently manages climate change issues under the ESA.

The Endangered Species Act defines an endangered species as one at risk of extinction “throughout all or a significant portion of its range.” The U.S. Department of the Interior (DOI) has repeatedly defined “significant portion” to mean an area of the range essential to species persistence. This definition is redundant, and various iterations of the definition have been struck down in the past. At the same time, other proposals to list a species only in a portion of its range fail to satisfy the statutory requirements.

Marine litter is human-created waste that has been discharged into the marine environment, including glass, metal, plastics, and other debris. According to data compiled by the United Nations, the equivalent of a garbage truck filled with plastic is dumped into the ocean every minute—more than 8 million metric tons per year. On November 11, 2019, the Environmental Law Institute hosted an expert panel that explored recent U.S.

Our country's landscape has changed dramatically over the last 50 years as a result of numerous governmental policies and subsidies that encourage low-density development commonly referred to as "sprawl." Sprawl results in environmental problems ranging from air pollution to wetland degradation. Our countryside is disappearing and becoming more fragmented, while urban areas are simply neglected. Moreover, this type of growth, which has gone unchecked for the latter half of this century, increases traffic congestion, strains public budgets, and deteriorates our quality of life.