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THE TOP FIVE

1. Transportation Department Joins the War on Wind

Add the Department of Transportation to the list of federal agencies waging what Heatmap’s Jael Holzman called “Trump’s total war on wind.” The Transportation Department said Friday it was eliminating or withdrawing $679 million in federal funding for 12 projects across the country designed to buttress development of offshore turbines. The funding included $427 million awarded last year for upgrading a marine terminal in Humboldt County, California, meant to be used for building and launching floating wind turbines. The list also included a $48 million offshore wind port on Staten Island, $39 million for a port near Norfolk, Virginia, and $20 million for a staging terminal in Paulsboro, New Jersey. “Wasteful, wind projects are using resources that could otherwise go towards revitalizing America’s maritime industry,” Secretary of Transportation Sean Duffy said in a statement. “Joe Biden and Pete Buttigieg bent over backwards to use transportation dollars for their Green New Scam agenda while ignoring the dire needs of our shipbuilding industry.”

It’s just the Trump administration’s latest attack on wind. The Department of the Interior has led the charge, launching a witch hunt against any policies perceived to favor wind power, de-designating millions of acres of federal waters for offshore wind development, and kicking off an investigation into bird deaths near turbines. Last month, the Department of Commerce joined the effort, teeing up future tariffs with its own probe into whether imported turbines pose a national security threat to the U.S. In response, the Democratic governors of New York, Massachusetts, Connecticut, Rhode Island, and New Jersey on Monday issued a statement calling on the administration “to uphold all offshore wind permits already granted and allow these projects to be constructed.”

2. California and Exxon Mobil battle over plastics

Only a tiny percentage of plastic waste is recycled.Christopher Furlong/Getty Images

In what the New York Times called a “sharp escalation” of its legal strategy to fend off liability for pollution, Exxon Mobil has countersued California, accusing the state’s landmark litigation over plastic waste of defaming the oil giant. At a court hearing last month, Exxon attorney Michael P. Cash described the lawsuit California Attorney General Rob Bonta and a cadre of environmental groups first filed last year as “an attack” aimed at the oil company’s home state of Texas and said the issue should be litigated there. As Times reporter Karen Zraick noted, Cash illustrated his point by displaying “a graphic showing a missile aimed at Texas from California” and by comparing Bonta and his nonprofit allies to “The Sopranos.”

Backed by a parallel lawsuit filed by the Sierra Club, Baykeeper, Heal the Bay, and the Surfrider Foundation, Bonta sued Exxon in state court on the grounds that the company had deceived Californians by “promising that recycling could and would solve the ever-growing plastic waste crisis,” alleging that the pollution had created a public nuisance and sought damages worth “multiple billions of dollars.” The lawsuit mirrors past litigation over planet-heating emissions, but targets the petrochemical division that has been one of the fastest-growing for Exxon and other oil giants. The courtroom drama came right as international negotiations in Geneva over a global treaty to curb plastic pollution failed after the United States joined Russia and other petrostates to block measures supported by more than 100 other nations that would have curbed production.

3. The U.S. is facing potential uranium shortfalls

In North America, nuclear fuel may soon become harder to come by. Canadian uranium giant Cameco has warned that delays in ramping up production at its McArthur River mine in Saskatchewan could shrink its forecast output for the year. The move came just a week after one of the world’s other major suppliers of uranium, Kazakhstan’s state-owned miner Kazatomprom, announced plans to slash its production by 10% next year.

The pullback is happening right as the U.S. nuclear industry’s dealmaking boom is taking off. Now that Trump’s tax law assured that support for atomic energy would continue, Adam Stein from the Breakthrough Institute told Heatmap’s Katie Brigham that more reactor plans are coming. “We might have seen more deals earlier this year if there wasn’t uncertainty about what was going to happen with tax credits. But now that that’s resolved, I expect to hear more later this year,” he told Katie. That includes Europe. Despite similarly lethargic construction of reactors over the last three decades, France and Germany have finally united around the need for more atomic energy to power the continent’s energy transition. A pact signed at last week’s Franco-German summit “appears to herald rapprochement on reactors,” the trade publication NucNet surmised.

4. Cadillac’s rebirth as a luxury EV maker faces a test

Once a stodgy gas-guzzling automaker, Cadillac refashioned itself as a luxury electric vehicle maker in recent years, rising alongside Chevrolet to put General Motors in the No. 2 slot behind Tesla. Roughly 70% of buyers who purchased the electric versions of the Cadillac Optiq or Lyriq switched from other luxury brands, including 10% who previously owned Tesla. That number could rise with Tesla’s brand loyalty nosediving, as this newsletter previously reported. “We’re in a position of great momentum,” John Roth, the global vice president of Cadillac, told The New York Times. “We offer more electric S.U.V.s than any luxury manufacturer, all with more than 300 miles of driving range.” But as Times reporter Lawrence Ulrich wrote, “that moment will soon be tested” as the electric car industry reels from the repeal of tax credits in President Trump’s One Big Beautiful Bill.

The challenges ahead are best illustrated through the Escalade, Cadillac’s iconic luxury SUV. The company sold just 3,800 electric Escalade IQs in the first six months of the year. While that’s a strong showing for a three-row SUV starting around $130,000, the V-8 engine gas-powered Escalade starts at about $87,000, and sold about 24,000 vehicles – roughly six times as many as the electric version.

5. Legal fight over Border Patrol’s arrest of firefighter heats up

Lawyers in Oregon are demanding the release of a firefighter arrested last week by Border Patrol while fighting a wildfire in Washington state. The man, whose name hasn’t been released, was among two firefighters cuffed in the Olympic National Forest as they fought to contain the Bear Gulch Fire that had burned about 14 square miles as of Friday and forced evacuations. The arrests sparked a political firestorm over what critics saw as a jarring example of the warped priorities of the Trump administration’s immigration crackdown. That’s particularly so in the case of this firefighter, who attorneys said had received his U-Visa certification from the U.S. Attorney’s Office in Oregon in 2017 and had submitted his U.S. Citizenship and Immigration Services application the following year.

When the AP asked the Bureau of Land Management why its contracts with two firefighting companies were terminated and 42 firefighters were escorted away from Washington’s largest wildfire, the agency declined to comment. The decisions came as the American West is essentially a tinderbox. As Heatmap’s Jeva Lange reported, Washington and Oregon are both at high risk of a megafire igniting this fall.

THE KICKER

Turns out mammoths weren’t just in the icy tundra. Scientists in Mexico discovered mammoth bones, shedding light on a once-obscure population of extinct tropical elephantids that ranged as far south as Costa Rica. In a paper published this week in Science, National Autonomous University of Mexico paleogenomicist Federico Sánchez Quinto documented the previously unknown lineage of the Santa Lucía mammoths, which he said split from northern Columbian mammoths hundreds of thousands of years ago. “If you had told me 5 years ago that I would be collecting these samples, I would have said, ‘You’re crazy,’” he said. “This paper really is an exciting beginning of something.”

Y-larvae, mysterious crustaceans related to barnacles, may be parasitic and are key to understanding barnacle evolution.

When most people think of barnacles, they imagine shell-like organisms clinging to boats, docks, or even whales. Yet some barnacles go far beyond passive attachment — they can actually invade and take over their hosts.

“Instead of gluing themselves to a rock or something, they glue themselves to a host, often a crab, and they inject themselves into that host, and live their entire life as a root network growing through their host. It’s almost like a fungal network or plant root system. They have no real body in the way that we think of animal bodies,” explains James Bernot, an assistant professor in the Department of Ecology and Evolutionary Biology at UConn.

Bernot and an international team of collaborators — including lead author Niklas Dreyer from the Natural History Museum of Denmark and Biodiversity Research Center Academia Sinica in Taiwan, Jørgen Olesen from the Natural History Museum of Denmark, Gregory Kolbasov from Moscow University, Jens Høeg from the University of Copenhagen, and Ryuji Machida and Benny Chan from the Biodiversity Research Center Academia Sinica — recently published a study in Current Biology on a puzzling group of crustaceans that may help resolve one of marine biology’s enduring mysteries.

The mystery of y-larvae

Barnacles are crustaceans, like crabs and shrimp, and have evolved unusual survival strategies. After a free-swimming larval phase, they spend the rest of their lives permanently attached to a chosen surface.

One especially mysterious group, known as “y-larvae” or Facetotecta, looks like juvenile barnacles. They have been documented in plankton samples since the 1800s, but no one has ever identified their adult stage. Bernot notes that this unresolved question remains central, though the team’s new research brings science closer to an answer.

To investigate where y-larvae belong on the crustacean family tree, the researchers gathered more than 3,000 specimens and examined their genes by sequencing the transcriptome — the set of expressed RNA molecules that reflects which genes are active.

Genetic analysis and hidden lives

“We were finally able to confirm, in the realm of big data science, that they are, in fact, related to barnacles, but they aren’t closely related to any of the other parasitic barnacles. This was interesting to test by building a giant tree of life for all the crustaceans, then adding this little branch of y-larvae, this very unknown group, to that bigger tree, and we saw that they are related to barnacles, but more as distant cousins,” says Bernot.

Though not closely related to parasitic barnacles, these crustaceans are also likely parasitic because they have some structures in common with their parasitic cousins, says Bernot, including antennae with claws that may be used to hook onto their host.

“One of the best pieces of evidence we have that y-larvae become parasitic is that if we expose them to crustacean growth hormone, they will hatch out of their little swimming larval shape into a small slug-like body, which is similar to what parasitic barnacles do when they enter a host,” says Bernot. “The fact that if we give them hormones, they also molt into a slug-like thing, suggests they go on to be parasitic somewhere, but we still don’t know what host they end up in. Being hidden inside another animal’s body could explain why we haven’t found the adult stage of y-larvae yet.”

Although these crustaceans are unusual and largely unknown with only 17 species described so far, Bernot says some of his co-authors found more than 100 new and different species from a single harbor in Japan. There is more to learn about these enigmatic animals.

Evolutionary strategies and ecosystem roles

“We were finally able to confirm, in the realm of big data science, that they are, in fact, related to barnacles, but they aren’t closely related to any of the other parasitic barnacles. This was interesting to test by building a giant tree of life for all the crustaceans, then adding this little branch of y-larvae, this very unknown group, to that bigger tree, and we saw that they are related to barnacles, but more as distant cousins,” says Bernot.

Although they are only distantly related to parasitic barnacles, the evidence suggests y-larvae are also parasitic. They share certain traits with parasitic barnacles, including clawed antennae that may help them latch onto a host.

“One of the best pieces of evidence we have that y-larvae become parasitic is that if we expose them to crustacean growth hormone, they will hatch out of their little swimming larval shape into a small slug-like body, which is similar to what parasitic barnacles do when they enter a host,” says Bernot. “The fact that if we give them hormones, they also molt into a slug-like thing, suggests they go on to be parasitic somewhere, but we still don’t know what host they end up in. Being hidden inside another animal’s body could explain why we haven’t found the adult stage of y-larvae yet.”

Despite being poorly understood, with only 17 described species, y-larvae may be far more diverse than previously thought. Bernot points out that some of his colleagues identified more than 100 distinct species from just a single harbor in Japan, suggesting much remains to be discovered about these unusual animals.

Ingenious barnacle adaptations

Different species of barnacles use different strategies when they become sessile adults. Besides living on inanimate objects, those that live on animals like whales are not considered parasitic because they are essentially hitching a ride and do not feed on their host. Others attach to the host and have structures that they use to feed on the host. Understanding the evolution of these different strategies is important, and Bernot says that a project they are currently working on involves building the evolutionary tree of all barnacles to observe and understand some of the evolutionary patterns.

“A big question is, what is it about barnacles that has given them so much variability over evolutionary time to take on so many different shapes and forms and lifestyles? They have come up with incredibly ingenious strategies for making their ways of life, and often their ways of life seem very bizarre to us, but they have clearly been very successful,” says Bernot. “These animals have been around for hundreds of millions of years and there are several thousand species of them, so they have come up with some really amazing solutions to complex problems.”

Some of those solutions could also help humans. For example, Bernot says, there is a lot of interest in trying to better understand barnacle glues.

“They glue themselves to docks, they glue themselves to boats, and that is a problem. The Navy spends millions of dollars on additional fuel because barnacles on their ships cause additional drag. Also having more powerful glues that can dry underwater would be very useful for mechanical reasons, but maybe also for dentistry and things like that,” says Bernot. “There could be a lot of applications if we can better understand some of these amazing solutions that barnacles have evolved.”

Reference: “Phylogenomics of enigmatic crustacean y-larvae reveals multiple origins of parasitism in barnacles” by Niklas Dreyer, James P. Bernot, Jørgen Olesen, Gregory A. Kolbasov, Jens Thorvald Høeg, Ryuji J. Machida and Benny K.K. Chan, 21 July 2025, Current Biology.
DOI: 10.1016/j.cub.2025.06.007

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