DUBAI — The vast, global efforts to arrest rising temperatures are imperiled and must accelerate, U.S. Vice President Kamala Harris told the world climate summit on Saturday. 

“We must do more,” she implored an audience of world leaders at the COP28 climate talks in Dubai. And the headwinds are only growing, she warned.

“Continued progress will not be possible without a fight,” she told the gathering, which has drawn more than 100,000 people to this Gulf oil metropolis. “Around the world, there are those who seek to slow or stop our progress. Leaders who deny climate science, delay climate action and spread misinformation. Corporations that greenwash their climate inaction and lobby for billions of dollars in fossil fuel subsidies.” 

Her remarks — less than a year before an election that could return Donald Trump to the White House — challenged leaders to cooperate and spend more to keep the goal of containing global warming to 1.5 degrees Celsius within reach. So far, the planet has warmed about 1.3 degrees since preindustrial times.

“Our action collectively, or worse, our inaction will impact billions of people for decades to come,” Harris said.

The vice president, who frequently warns about climate change threats in speeches and interviews, is the highest-ranking face of the Biden White House at the Dubai negotiations.

She used her conference platform to push that image, announcing several new U.S. climate initiatives, including a record-setting $3 billion pledge for the so-called Green Climate Fund, which aims to help countries adapt to climate change and reduce emissions. The commitment echoes an identical pledge Barack Obama made in 2014 — of which only $1 billion was delivered. 

Meanwhile, back in D.C., the Biden administration strategically timed the release of new rules to crack down on planet-warming methane emissions from the oil and gas sector — a significant milestone in its plan to prevent climate catastrophe.

The trip allows Harris to bolster her credentials on a policy issue critical to the young voters key to President Joe Biden’s re-election campaign — and potentially to a future Harris White House run. 

“Given her knowledge base with the issue, her passion for the issue, it strikes me as a smart move for her to broaden that message out to the international audience,” said Roger Salazar, a California political strategist and former aide to then-Vice President Al Gore, a lifetime climate campaigner. 

Yet sending Harris also presents political peril. 

Biden has taken flak from critics for not attending the talks himself after representing the United States at the last two U.N. climate summits since taking office. And climate advocates have questioned the Biden administration’s embrace of the summit’s leader, Sultan al-Jaber, given he also runs the United Arab Emirates’ state-owned oil giant. John Kerry, Biden’s climate envoy, has argued the partnership can help bring fossil fuel megaliths to the table.

Harris has been on a climate policy roadshow in recent months, discussing the issue during a series of interviews at universities and other venues packed with young people and environmental advocates. The administration said it views Harris — a former California senator and attorney general — as an effective spokesperson on climate. 

“The vice president’s leadership on climate goes back to when she was the district attorney of San Francisco, as she established one of the first environmental justice units in the nation,” a senior administration official told reporters on a call previewing her trip. 

Joining Harris in Dubai are Kerry, White House climate adviser Ali Zaidi and John Podesta, who’s leading the White House effort to implement Biden’s signature climate law. 

Biden officials are leaning on that climate law — dubbed the Inflation Reduction Act — to prove the U.S. is doing its part to slash global emissions. Yet climate activists remain skeptical, chiding Biden for separately approving a series of fossil fuel projects, including an oil drilling initiative in Alaska and an Appalachian natural gas pipeline.

Similarly, the Biden administration’s opening COP28 pledge of $17.5 million for a new international climate aid fund frustrated advocates for developing nations combating climate threats. The figure lagged well behind other allies, several of whom committed $100 million or more.

Nonetheless, Harris called for aggressive action in her speech, which was followed by a session with other officials on renewable energy. The vice president committed the U.S. to doubling its energy efficiency and tripling its renewable energy capacity by 2030, joining a growing list of countries. The U.S. also said Saturday it was joining a global alliance dedicated to divorcing the world from coal-based energy. 

Like other world leaders, Harris also used her trip to conduct a whirlwind of diplomacy over the war between Israel and Hamas, which has flared back up after a brief truce.

U.S. National Security Council spokesperson John Kirby said Harris would be meeting with “regional leaders” to discuss “our desire to see this pause restored, our desire to see aid getting back in, our desire to see hostages get out.”

The war has intruded into the proceedings at the climate summit, with Israeli President Isaac Herzog and Palestinian Authority leader Mahmoud Abbas both skipping their scheduled speaking slots on Friday. Iran’s delegation also walked out of the summit, objecting to Israel’s presence.

Kirby said Harris will convey “that we believe the Palestinian people need a vote and a voice in their future, and then they need governance in Gaza that will look after their aspirations and their needs.”

Although Biden won’t be going to Dubai, the administration said these climate talks are “especially” vital, given countries will decide how to respond to a U.N. assessment that found the world’s climate efforts are falling short. 

“This is why the president has made climate a keystone of his administration’s foreign policy agenda,” the senior administration official said.

Robin Bravender reported from Washington, D.C. Zia Weise and Charlie Cooper reported from Dubai. 

Sara Schonhardt contributed reporting from Washington, D.C.