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The Trump administration recently repealed the U.S. Environmental Protection Agency’s 2009 endangerment finding—the scientific and legal determination that greenhouse gases threaten public health and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.

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.

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.

The current Trump administration has made individualized exceptions and waivers one of the signature features of its governing approach.

There are many reasons why Senate Republicans’ recent decision to defy the parliamentarian and repeal California’s Clean Air Act waivers using the Congressional Review Act (CRA) was objectionable. But one objection that hasn’t received enough – any? – attention is how legislative gimmicks like the CRA contribute to the broader problem of congressional dysfunction.

Never before in our lifetimes has the rule of law felt so tenuous. These are not normal times for a research and advocacy organization dedicated to “harnessing the power of law and public policy to create a responsive government, healthy environment and just society.” Many of the policy ideas that we have championed — for example, worker safety protections, a fair regulatory system, climate actions that address equity concerns — have been adopted in some form. And today, these policies, as well as the democratic institutions which enforce them, are under threat.

In April, the Trump administration published an executive order (EO) boosting the coal industry in hopes of a grand revival for an energy source that has been in stark decline since more cost-effective sources, including gas and renewables, drove it from its peak nearly two decades ago. Included in this order was a two-year exemption to a rule that would have required some of the country’s most polluting power plants to reduce emissions of mercury and other hazardous air pollutants that harm our health.

Since our last update (March 18), we have seen some small changes regarding CRA resolutions. There have been no new resolutions signed into law (only two so far), and there are now seven resolutions that have passed one chamber. This means that in addition to the six resolutions that had already cleared one chamber (you can see our previous update for a detailed description of those resolutions), there have been votes on four other resolutions.