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Past pledges from nearly 200 nations have fallen far short and new plans submitted this year , experts say. And if the numbers aren't sobering enough for world leaders when they kick off the action Thursday, there's the setting: on the edge of a weakened Amazon.

Unlike past climate negotiations — and especially the one 10 years ago that forged the — this annual U.N. conference isn't primarily aimed at producing a grand deal or statement over its two weeks. Organizers and analysts frame this Conference of Parties — known less formally as COP30 — as the “implementation COP.”

“This is really going to be much more about what are we doing on the ground,” said former U.N. climate chief Christiana Figueres, who helped shepherd the 2015 Paris agreement aimed at limiting warming.

Figueres and many of more than three dozen experts interviewed by The Associated Press said negotiators have already pinned down the goal. What's needed now is and political will for countries to put decades of words and promises into action and policy to reduce heat-trapping gases and . Only that will put the brakes on global warming as it careens toward a level the world has agreed is too dangerous, they say.

Adapting to a warmer world and saving forests

In Belem, diplomats, activists, scientists and business leaders will discuss new national climate-fighting plans, the need to save trees that absorb carbon pollution, how communities can adapt to warming and how to hit hardest by climate change.

will preside and set the agenda. For the talks to be a success, world leaders need to beef up efforts and money for adapting to climate change and fund billion-dollar efforts to prevent deforestation and land degradation, said Suely Vaz, who used to run Brazil's environment agency.

Those leaders arrive Thursday for a two-day pre-meeting summit to discuss ratcheting up the fight against climate change.

“Holding COP in the Amazon itself creates a new level of accountability. You can’t talk about climate solutions while standing on the land that’s absorbing the planet’s carbon and ignore the people who protect it,” said Eriel Tchekwie Deranger, a member of the Athabasca Chipewyan First Nation in Alberta, Canada, and executive director of the nonprofit Indigenous Climate Action.

Top polluters won't be at pre-summit

That high-level meeting is likely to be missing top leaders of the biggest carbon-polluting nations: China, the U.S. and India. They contribute about 52% of the world's heat-trapping carbon dioxide from the burning of coal, oil and natural gas.

China is sending its deputy premier. The U.S. is mostly skipping this conference under President Donald Trump, a who's begun the process of withdrawing from the Paris agreement. Some U.S. cities and states are coming to show that they and businesses take climate change seriously, said former U.S. Environmental Protection Agency chief Gina McCarthy, who co-chairs a group called America Is All In.

Palau President Surangel Whipps Jr. said it’s important world leaders understand the threat to countries like his: “Without the United States, without China, without India committing, we really have no hope.”

“We want to see action ... particularly from the largest polluters,” Whipps said. “Our communities live on the front lines and we cannot afford more promises.”

Figueres said she hopes “because of the craziness in the United States that there is an expanded sense of, this is the moment to pull together.”

But Panama's environment minister, Juan Carlos Navarro, told the AP he expects little from the talks. He said such meetings have become “a jet-setting orgy of bureaucrats who travel around the world with a tremendous carbon footprint and achieve nothing.”

Promising to cut more pollution or focusing on fulfilling pledges?

There's already a divide on the nature of this meeting. Brazil is stressing implementation of past plans as well as what's in new emissions-cutting plans submitted this year. But smaller island nations, such as Palau, and scientists are saying that's not enough. It dooms Earth to 3 degrees Celsius (5.4 degrees Fahrenheit) of warming since pre-industrial times, they said.

Palau and other island nations want negotiators to tell countries to be more ambitious in their new carbon pollution-cutting plans.

Implementing “mediocrity," said Natural Resources Defense Council adaptation chief Adelle Thomas, "is not creating a future for vulnerable nations.”

But if nations do what they've already promised in past climate-fighting plans, it could trim an entire degree Celsius — 1.8 degrees Fahrenheit — from projected warming, said Ani Dasgupta, chief executive of World Resources Institute. Scientists agreed with the estimate. Dasgupta said negotiators have too long focused on big commitments instead of outcomes in the real economy, which he said is “the messier thing” that doesn’t get headlines.

“What we now need to do is deliver against what we have signed on to,” said scientist Johan Rockstrom, director of the Potsdam Institute for Climate Research in Germany.

Path to disaster or optimism?

“The challenge today is not whether we will phase out fossil fuels. The challenge today is will we be too late?” Rockstrom said. “We are heading towards catastrophic 3 degrees."

Figueres, the former U.N. climate chief, agreed it looks bad. But she co-founded an a organization called and said she's sure the world can do this.

“My optimism is not naive. I know what we’re up against,” she said. “But my optimism is about determination. It’s about we’re up against a really, really, really challenging threat here. And we don’t give up.”

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Borenstein reported from Washington. Isabel DeBre contributed from Buenos Aires and Melina Walling from Chicago.

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