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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.

In 2025, North Carolina saw an effective repeal of its carbon plan, and the state is now on track to approve over 100 data center projects. This will further imperil the state’s 2050 decarbonization goal while creating a new slew of environmental and public health concerns and electricity affordability problems. The state is charting a harmful path and should change course before its policies hurt more people and communities.

A fan of place-based education, every year I haul my students to Louisiana’s Maurepas Wildlife Management Area to paddle the swamps and learn about coastal law. This semester, I had ten students with me, each paddling a kayak on the swamp’s shimmering water. Bits of salvinia, a free-floating aquatic fern, eased downstream at an almost imperceptible rate. Stories on the bayou are always changing. This year, the narrative wrestled with a choice the state is making about what the Maurepas Swamp will become — an ecological jewel or a carbon-capture dump. The community is torn.

We mourn the lives of all Iranian civilians and U.S. service members lost in the illegal preemptive strike on Iran, and that of all civilians killed and hurt in subsequent strikes in the region. This war is continuing to fuel broader conflict and instability in the region and around the world. We join every American who objects to this war. Our planet can be a beautiful place, and stewarding and protecting all of its inhabitants and its natural resources is our noblest calling.

If the Trump EPA successfully repeals the endangerment findings for vehicles and stationary sources, states will be the only resort for climate action. A key question is how the repeals would impact state power relating to carbon emissions. The bottom line answers are: (1) the impact on state power to regulate tailpipe emissions seems unclear but could be positive; (2) there would be no effect on state power to regulate stationary sources like power plants; (3) plaintiffs suing oil companies would probably benefit.

Last week, the U.S. Environmental Protection Agency (EPA) overturned its 2009 finding that greenhouse gas emissions from vehicles endanger human health and welfare. EPA argued that it lacked the legal power to regulate these greenhouse gas emissions. As I have written elsewhere, EPA’s arguments are difficult to square with a landmark decision by the U.S. Supreme Court, Massachusetts v. EPA.

Data centers are increasingly making headlines for the serious problems they create for the communities where they are proposed and built, as well as for the resistance from people who live there, who refuse to accept the rising energy bills, noise and air pollution, and strains on water infrastructure that inevitably accompany these new neighbors. On Tuesday, February 10, I moderated a webinar, “From Community to Congress: Advocating on AI Data Centers,” that broke down the (de)regulatory landscape of data centers.

The other shoe has dropped with the announcement of the final rule repealing the U.S. Environmental Protection Agency’s (EPA) 2009 finding that greenhouse gases endanger human health and welfare. The Trump administration has the nasty habit of announcing new regulations before posting them. That means that for the moment, we are limited to the EPA press release.

Over the course of more than a century, serious statespeople came together to build the modern administrative state out of a shared commitment to redeeming their constitutional duty to form a more perfect union. The February 12 action to rescind the 2009 EPA endangerment finding represents the single greatest defiance of that project yet by the Trump administration.