COP29 negotiators welcomed a pledge by major development banks to lift funding to poor and middle-income countries struggling with global warming as an early boost to the two-week summit.
A group of lenders, including the World Bank, announced a joint goal of increasing this finance to $120 billion by 2030, a roughly 60 per cent increase on the amount in 2023.
"I think it's a very good sign," Irish Climate Minister Eamon Ryan told Reuters on Wednesday.
"It's very helpful. But that on its own won't be enough", Ryan said, adding countries and companies must also contribute.
China's Vice Premier Ding Xuexiang said that Beijing has already mobilized around $24.5 billion to help developing countries address climate change.
Ryan's view was echoed by Patrick Verkooijen, CEO of the Global Center on Adaptation who welcomed the announcement as "a shot in the arm for the climate finance discussion"
"But there is so much more work ahead," he added.
The chief aim of the conference in Azerbaijan is to secure a wide-ranging international climate financing agreement that ensures up to trillions of dollars for climate projects.
Developing countries are hoping for big commitments from rich, industrialized nations that are the biggest historical contributors to global warming, and some of which are also huge producers of fossil fuels.
"Developed countries have not only neglected their historical duty to reduce emissions, they are doubling down on fossil-fuel-driven growth," said climate activist Harjeet Singh.
Wealthy countries pledged in 2009 to contribute $100 billion a year to help developing nations transition to clean energy and adapt to the conditions of a warming world.
But those payments were only fully met in 2022 and the pledge expires this year.
Hopes for a strong deal have been dimmed by Donald Trump's US election win. The President-elect has promised to again withdraw the US from international climate cooperation.
The United States is already the world's largest oil and gas producer and Trump has vowed to maximize output.
Officials representing President Joe Biden's outgoing administration at COP29 have said China and the European Union may need to pick up the slack if Washington cedes leadership.
"We have a clear choice between a safer, cleaner, fairer future and a dirtier, more dangerous, and more expensive one. We know what to do. Let's get to work. Let's get it done," US climate envoy John Podesta told the conference.
With 2024 on track to be the hottest year on record, scientists say global warming and its impacts are unfolding faster than expected.
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