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EPA has said it would no longer try to quantify the harms done by the two most serious, widespread air pollutants. Given that these are the most fully understood of all environmental impacts, it’s not clear what future regulations, if any, might still be subject to cost-benefit analysis. This didn’t come out of the blue. Rather, it is the culmination of a series of steps that began when President Donald Trump first took office in 2017.

It is tempting to think that the threat of the current Congress abusing the Congressional Review Act (CRA) is over, now that the deadline to revisit rules implemented during the previous Congress’s session—provided by the CRA’s unique “lookback provision”—has formally passed. But that would be a mistake, as conservative lawmakers have found novel ways to target agency actions from previous administrations.

The question of which court should hear a case isn’t always as easy as it might seem — and the answer can sometimes make a difference in the potential outcome. For instance, in 2013, the government of Plaquemines Parish, Louisiana, decided to sue several oil companies for violating a 1978 state law that required a state permit for oil production along the Louisiana coast.

The Trump administration recently repealed the U.S. Environmental Protection Agency’s 2009 endangerment finding—the scientific and legal determination that greenhouse gases threaten public health and welfare that has anchored federal climate regulation for nearly two decades. Environmental Protection Agency Administrator Lee Zeldin called the finding “the Holy Grail of federal regulatory overreach.” Within weeks, a coalition of more than 20 states filed suit in the U.S. Court of Appeals for the D.C. Circuit to reverse the repeal. The legal battle that follows will help define American environmental policy for a generation. Brigham Daniels and I did not plan the timing of our new book, Lessons for a Warming Planet: A Vital History of US Environmental Law, to coincide with this particular legal conflict. But we could not have chosen a more clarifying moment for its release. The endangerment finding repeal is not an aberration—it is a recognizable recurrence in a history that stretches back centuries. Law has always been the primary engine of both environmental exploitation and protection in the United States.

The U.S. Forest Service (USFS) is undergoing one of the most consequential and likely disruptive transformations in its 121-year history. The agency plans to relocate its headquarters from Washington, D.C., to Salt Lake City and overhaul its structure and management. According to a Forest Service press release from March 31, the overhaul aims to bring leadership “closer to the forests and communities they serve,” replacing the agency’s long-standing regional model with a state-based structure. At first glance, the rationale seems intuitive. Forest management should be informed by local conditions, local relationships, and decisions made closer to the ground. But that premise raises a more fundamental question: what happens when the scientific infrastructure that informs those decisions is dismantled at the same time?

As the release date of my forthcoming book, Unlearn Power: Strengthening Communities in the Age of Environmental Crisis, approaches, naturally, I've been asked, "What's the book about?" But given the amalgamation of ecological devastation across the planet, with fallout and stakes unevenly felt across socioeconomic lines and underscored by political forces that engage in climate denialism and assaults on democratic institutions, I urge that "Why Unlearn Power?" is the more apropos question.

The 56th Earth Day may also be the bleakest. Wave upon wave is crashing upon our system of ecological protections. But having spent years studying the full sweep of American environmental legal history, we can say with confidence: the bigger the wave, the stronger the undercurrent.

Maryland’s 2026 legislative session represented a challenging playing field for advancing climate and environmental legislation, marked heavily by the dual considerations of budget shortfalls — driven by the federal government’s abandonment of funding critical programs and sowing chaos among the numerous federal workers who live in Maryland — and uncertainty as to long-term energy reliability and affordability placing a pall on energy planning in the state.

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.