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This Earth Day, environmental advocates are looking backward as well as forward. With the U.S. federal government so dramatically overhauling environmental policy, history shows how American social movements of the 19th and 20th centuries overcame seemingly insurmountable odds to preserve public lands and pass laws protecting human health. “I’ve been trying to look through the history of the United States to understand how we’ve gotten where we are,” said Alejandro Camacho, a Professor of Law at UCLA School of Law and co-author of Lessons for a Warming Planet: A Vital History of U.S. Environmental Law, which comes out on Earth Day, April 22, 2026. “Prior generations did meet the moment and at least partially addressed some of the major problems that were in front of them.” Camacho discusses the book in this lightly edited transcript.