Nations at the COP29 summit in November are aiming for a new finance goal to replace the $100 billion a year that rich countries pledged to help the developing world tackle global warming.
That goal expires in 2025 and is considered well below what the world's most climate vulnerable nations need to prepare for the future and reduce their own planet-heating emissions.
Rich country donors, including the United States and European Union, have agreed to keep paying climate finance, but have baulked at demands for $1 trillion a year or more.
They have not made an offer, but COP29 hosts Azerbaijan on Monday indicated that hundreds of billions of dollars in public money would be a "realistic" target.
The latest draft of the funding pact, released by the UN climate secretariat, refines an earlier version by putting three distinct pathways on the table but leaves much unsettled.
The first option presents the deal sought by developing countries -- namely that rich, industrialised nations most responsible for climate change to date pay from their budgets.
This would entail annual payments up to $2 trillion a year in "grant-equivalent terms" over an unspecified timeframe, the draft stated.
The second option "encourages" other countries to share the burden, a key demand of developed countries, especially those weathering budget and political pressure at home.
This proposal calls for "all sources" of finance -- public and private -- to play a part.
The third options puts forward a mix of the other two.
The question of how much rich nations are actually willing to pay -- no concrete figure has been put forward during months of protracted negotiations -- remains open.
The EU, the largest contributor of climate finance, on Monday announced its negotiating position for COP29 but did not propose an amount.
It said however that "public finance alone cannot deliver the levels of finance needed" and that private investment would need to make up the majority.
Azerbaijan will host the COP29 summit between November 11 - 22 in Baku.
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