BAKU, Azerbaijan, Nov 11, (AP): A complex international two-week-long game of climate change poker is convening. The stakes? Just the fate of an ever-warming world. Curbing and coping with climate change's worsening heat, floods, droughts and storms will cost trillions of dollars and poor nations just don't have it, numerous reports and experts calculate.

As United Nations climate negotiations started Monday in Baku, Azerbaijan, the chief issue is who must ante up to help poor nations and especially how much. The numbers are enormous. The floor in negotiations is the $100 billion a year that poor nations - based on a categorization made in the 1990s - now get as part of a 2009 agreement that was barely met.

Several experts and poorer nations say the need is $1 trillion a year or more. "It's a game with high stakes,” said Climate Analytics CEO Bill Hare, a physicist. "Right now the fate of the planet depends very much on what we're able to pull off in the next five or 10 years.” But this year's talks, known as COP29, won't be as high-profile as last year's, with 48 fewer heads of state scheduled to speak.

The leaders of the top two carbon polluting countries - China and the United States - will be absent. But if money negotiations fail in Baku, it will handicap 2025’s make-or-break climate negotiations, experts say. Not only is dealing with money always a touchy subject, but two of the rich countries that are expected to donate money to poor nations - the United States and Germany - are in the midst of dramatic government changes.

Even though the United States delegation will be from Biden Administration, the reelection of Donald Trump, who downplays climate change and dislikes foreign aid, makes US pledges unlikely to be fulfilled. The overarching issue is climate finance. Without it, experts say the world can't get a handle on fighting warming, nor can most of the nations achieve their current carbon pollution-cutting goals or the new ones they will submit next year.