BELÉM, Brazil — Gavin Newsom can’t get out of a meeting or a talk at the international climate talks here without being swarmed by reporters and diplomats eager for a quote, a handshake, a photo.

On a tour Tuesday of a cultural center with Gov. Helder Barbalho, the leader of the Brazilian state hosting the talks, a passerby recognized them both. “There’s the governor,” he exclaimed. “And there’s the California governor.” Later in the day, as Newsom rode up an escalator packed with reporters and international officials on his way to deliver a speech, a bystander shouted: “The escalator’s not broken for you!” — a dig at President Donald Trump, who once had an escalator malfunction on him at the United Nations.

Newsom grinned wide: “Oh, I like that.”

The adulation was gold for a governor with presidential aspirations as he steps into a power vacuum. The Trump administration is trying to dismantle climate policies both at home and abroad, and other likely Democratic presidential contenders are absent from the United Nations climate talks. Seeing a chance to plant his green flag on an international stage, Newsom is embracing the role of climate champion as his own party backs away at home and the politics of the issue shift rightward.

It’s a role fitting Newsom’s instincts: anti-Trump, pro-environment and pro-technology, and with a political antenna for the upside of picking fights, finding opportunity in defiance.

“We’re at peak influence because of the flatness of the surrounding terrain with the Trump administration and all the anxiety,” he told POLITICO from the sidelines of a green investor conference in Brazil on Monday.

Newsom’s profile has never been higher. Just days before traveling to Brazil, he celebrated a decisive win in his redistricting campaign to boost Democrats in the midterms. He is polling at or near the top of presidential primary shortlists, and is amassing an army of small-dollar donors across the states.

The governor couldn’t walk down the hallway at the conference without getting swarmed, undeniably the star of the talks on their second formal day. At one point, security officials had to physically shove away one man repeatedly. Conference attendees yelled out “Keep up the social media!” and “Go Gavin!” (and the occasional “Who is that?”).

The first question by the Brazilian press: Are you running for president? And from business people: Are you coming back?

Yet in touching down here — and in emphasizing his climate advocacy more broadly — Newsom is assuming a significant risk to his post-gubernatorial ambitions. The rest of the world may wish America were more like California, but the country itself — even Democrats who will decide the 2028 primary — are far more skeptical. What looks like courage abroad can read as out-of-touch back home, in a country where voters, including Democrats, routinely rank any number of issues, including the economy, health care, and cost-of-living, as more pressing than global warming.

The stage is set

Other blue states were already backing away from Newsom’s gas-powered vehicle phase-out even before Congress and Trump ended it this summer, and another possible Democratic contender for president, Pennsylvania Gov. Josh Shapiro, may pull his state out of a regional emissions trading market as part of a budget deal, a move seen as tempering attacks from the right on climate.

Even in California, where a new Carnegie Endowment for International Peace poll finds that Californians increasingly want their state government to play a bigger role on the international stage, trade trumped climate change as voters’ top priority for international talks for the first time this year.

“There’s not a poll or a pundit that suggests that Democrats should be talking about this,” Newsom acknowledged in an interview. “I’m not naive to that either, but I think it’s the way we talk about it that’s the bigger issue, and I think all of us, including myself, need to improve on that and that’s what I aim to do.”

In his 2020 presidential campaign, Joe Biden prevailed not after embracing — but rather, distancing himself from — the “Green New Deal,” which Newsom acknowledged this month had become a “pejorative” on the right. Four years later, Trump pilloried Kamala Harris in the general election for her past positions on climate change.

Newsom is already facing relentless attacks from the right on energy: two years ago, in what was seen at the time as a shadow presidential debate, Florida Gov. Ron DeSantis was skewering Newsom for his phase-out of gas-powered vehicles: “He is walking his people into a big-time disaster,” DeSantis said. And that was before Republicans began combing Newsom’s social media posts for material to weaponize in future ads.

Even Newsom’s predecessor, former Gov. Jerry Brown, who made climate change his signature issue, acknowledged “climate is not the big issue in South Carolina or in Maine or in Iowa.”

“Climate is important,” Brown said in an interview. “But it’s not like immigration, it’s not like homelessness, it’s not like taxes, it’s not like inflation, not like the price of a house.”

Still, Brown cast climate as an existential issue. “It’s way beyond presidential politics. It is about our survival and your well being for the rest of your life,” he said. “I think he’s doing it because he thinks it’s profoundly important, and certainly politics is not divorced entirely from reality.”

Newsom’s inner circle senses a political upside, too. His first-ever visit to the climate talks comes not just from his own or California’s ambitions, but from the vacuum left by Trump.

“The more that Trump recedes, like a tide going out, the more coral is exposed. And that’s where Newsom can really flourish,” said Jason Elliott, a former deputy chief of staff and an adviser since Newsom’s early days in elected office.

Newsom is “going against the grain,” he continued. “It’s easier to be some of these purple or red state governors in other places in the United States that just wash their hands of EVs the minute that the going gets tough. But that’s just not Newsom.”

On climate, Newsom’s attempts to stand alone sit well within the California tradition. Brown and Arnold Schwarzenegger — the Democrat and the Republican who preceded him — both made international climate diplomacy central to their legacies.

“We have been at this for decades and decades, through Republican and Democratic administrations,” Newsom said. “That’s an important message at this time as well, because we’re so unreliable as a nation, and we’re destroying alliances and relationships.”

Also in Brazil for part of the talks were Govs. Tony Evers of Wisconsin and Michelle Lujan Grisham of New Mexico, both Democrats, and mayors of several major U.S. cities, like Kate Gallego of Phoenix. But their pitch didn’t land with quite the same heft as California’s, a state filled with billion-dollar tech companies that, as Newsom frequently boasts, recently overtook Japan as the world’s fourth-largest economy.

He attributed his environmental streak to his family, citing his father, William Newsom, a judge and longtime conservationist. As mayor of San Francisco, Newsom signed a first-in-the-nation composting mandate and plastic bag ban. As lieutenant governor to Brown, Newsom called himself “a solution in search of a problem” because Brown had embraced climate so prominently. But Brown said Newsom has made the issue his own. “I think Newsom comes to this naturally,” he said.

Newsom pulls from a wide range of influences; prolific texting buddies include former Washington Gov. Jay Inslee, who ran for president largely on a climate platform, and former Secretary of State John Kerry. He frequently cites the example of President Ronald Reagan, the Republican — and former California governor — who embraced an environmental agenda. “I talk to everybody,” Newsom said.

He spoke in almost spiritual terms about his upcoming trip deeper into the Amazon, where he’s scheduled to meet with community stewards and walk through the forest.

“When we were all opening up those first books, learning geography, one of the first places we all learn about is the Amazon,” he said. “It’s so iconic, so evocative, so it informs so much of what inspires us as children to care about the Earth and Mother Nature. It connects us to our creator.”

The mid-transition hurt

As governor, Newsom hasn’t had the luxury his predecessors enjoyed of setting ambitious emissions targets, but instead is working in a period beset by natural disasters and tensions with both the left and moderate wings of his party. His aides have dubbed it the remarkably un-sexy “mid-transition”: The deadlines to show results are here, they’re out of reach — and in the interim, voters are mad about energy prices.

As a result, he’s pushed to ban the sale of new gas-powered cars by 2035 and directed billions toward wildfire prevention and clean-energy manufacturing — but also reversed past positions against nuclear and Big Oil, including extending the life of California’s last nuclear power plant, pausing a profit cap on refineries and expanding oil drilling in Kern County.

Inside the administration, those moves are seen as not a tempering of environmental ambition but a pragmatic recalibration. “We’re transitioning to the other side, and there’s a lot of white water in that. And that’s reality. You’ve got to deal with cards that are dealt,” Newsom said in an interview in São Paulo.

But it also exposes him to criticism from both the left and moderate wings of his own party. Newsom’s 2023 speech excoriating oil companies to the United Nations in New York City was one of his proudest moments of his career. This year, he faced banners attacking him: “If you can’t take on Big Oil, can you take on Trump?”

At the same time, former Los Angeles Mayor Antonio Villaraigosa, a Democrat, has seized on high gas prices in his campaign to succeed Newsom as governor in 2026 — and is partly blaming past governors’ climate policies.

Adding to the crunch are the record-setting wildfires that have beset Newsom’s tenure as governor. They’ve not only devastated communities from Paradise in Northern California to Altadena in Los Angeles County but buoyed both electricity prices as utilities spend billions on fire-proofing their grid and property insurance prices as insurers flee the state. It’s this duality that informs Newsom’s approach.

“We’ve got to address costs or we’ll lose the debate,” Newsom said. “This is the hard part.”

A business moderate known to hand out personal phones programmed with his number to tech CEOs, Newsom is now pitching his climate fight as one focused on economic competitiveness and jobs. Lauren Sanchez, the chair of the state’s powerful air and climate agency, the California Air Resources Board, called the state’s international leadership the governor’s “north star” on climate change. “He is in the business of ensuring that California is relevant in the future economy,” she said.

In Brazil, Newsom made the time to stop by a global investors summit in São Paulo, where he held an hour-long roundtable with green bankers, philanthropists and energy execs.

They told him they wanted his climate pacts with Brazilian governments to do more on economic ties. So, Newsom said, he started drafting a new agreement there and then, throwing a paper napkin on the table in reference to the cocktail napkin deal that formed Southwest. “Let’s get this done before I leave,” Newsom said he told his Brazilian counterparts. “We move quickly.”

If the moment reflected California’s swagger, it also laid bare its limitations. The Constitution limits states from contributing money to international funds, like the tropical rainforest preservation fund that is the Brazilians’ signature proposal at the talks. And even at home, Trump is still making Newsom’s balancing act hard: Newsom floated backfilling the Trump administration’s removal of electric vehicle incentives with state rebates, then backtracked, conceding the state doesn’t have enough funds.

And on Tuesday, reports came out that the Trump administration was planning to offer offshore oil and gas leases for the first time in decades off the coast of California — putting Newsom on the defensive.

Newsom called those plans “dead on arrival.”

“I also think it remarkable that he didn’t promote it in his backyard at Mar-a-Lago; he didn’t promote it off the coast of Florida,” Newsom added.