As world leaders gathered in Brazil for this year’s global summit on the accelerating climate crisis this week, many took note of the absence of US President Donald Trump.

This year’s United Nations Climate Change Conference (COP30) summit comes on the tenth anniversary of the Paris Climate agreement, in which nations committed to adopting policies intended to keep global temperature increases below the threshold of 1.5°C above preindustrial levels, considered a tipping point at which many of the worst ravages of climate change will become irreversible.

Ten years later, progress has fallen far short of the mark, with leaders scrambling to keep the deal’s goals intact—an aim that is likely untenable without the cooperation of the US, the globe’s largest historical emitter of carbon.

America’s president has not only once again pulled the US out of the Paris agreement, but also sought to turn climate denial into public policy and spent his term in office thus far grinding American investment in renewable energy to a halt—actions viewed as extraordinary abdications of responsibility at a time when the globe is ever more rapidly approaching the point of no return for warming.

Fresh on climate advocates’ minds are Trump’s comments at the UN General Assembly in September, when he described climate change as the world’s “greatest con job.”

On Thursday, the World Meteorological Organization found that greenhouse gas emissions had reached a record high. Meanwhile, 2025 is on track to be the third hottest year on record, behind only 2024 and 2023.

“Every fraction of a degree means more hunger, displacement, and loss—especially for those least responsible," said UN Secretary-General António Guterres on Thursday. “This is moral failure—and deadly negligence.”

Brazilian President Luiz Inácio Lula da Silva, who has emerged as one of the world’s leading climate defenders from the heart of the Amazon rainforest, began the conference by delivering an indirect but unmistakable shot at Trump. He denounced the “extremist forces that fabricate fake news and are condemning future generations to life on a planet altered forever by global warming.”

Other Latin American leaders were more direct. Colombian President Gustavo Petro, whom Trump recently hit with sanctions and threatened with military action, denounced the US president as “against humanity,” as evidenced by “his absence” at the conference.

“The president of the United States at the latest United Nations General Assembly said the climate crisis does not exist,” added Chilean President Gabriel Boric. “That is a lie.”

In Trump’s stead, over 100 other state and local figures from US politics have traveled to Brazil to take part in the conference: Among them are California Gov. Gavin Newsom, New Mexico Gov. Michelle Lujan Grisham, and Wisconsin Gov. Tony Evers.

Another attendee is Phoenix Mayor Kate Gallego, chair of the Climate Mayors network, who recently applauded Tuesday night’s elections in the US. More than 40 candidates associated with the network came out victorious, as well as the self-described ecosocialist New York City Mayor-elect Zohran Mamdani.

“Our climate mayors did very well on the ballot,” Gallego said to applause at a local leaders forum for COP30. “We want to send this message from the US.”

But despite the US delegation, even with officials from the Trump administration absent, climate campaigners fear the White House may still seek to sabotage the conference from afar. Last month, the administration did just that when it used the threat of tariffs to strong-arm countries into killing what would have been a global-first carbon fee on shipping.

Even without Trump present, COP30 is crawling with fossil fuel lobbyists seeking to stymie progress. A report released Friday from the climate advocacy group Kick Big Polluters Out found that over 5,350 fossil fuel lobbyists have attended UN climate negotiations over the past four years. The corporations they represent are responsible for more than 60% of global emissions.

“These companies have defended their fossil interests by watering down climate action for years," said Fiona Hauke of the German environmental group Urgewald. "As we head towards COP30, we demand transparency and accountability: Keep polluters out of climate talks and make them pay for a just energy transition.”

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