World leaders gathered on the edge of the imperilled Amazon rainforest for a second day of the world's most important talks on climate change, as Brazil sought more pledges for a fund to preserve tropical forests.

Brazilian President Luiz Inácio Lula da Silva met with German Chancellor Friedrich Merz, hoping to win his support for an ambitious financial incentive scheme to support the conservation of the world's endangered forests.

Merz said afterwards that Germany would make a "considerable" pledge, but didn't specify an amount.

"We are supporting this initiative; Germany is contributing considerably," Merz said.

"If Germany says 'considerable,' it will be considerable."

The initiative, dubbed the Tropical Forest Forever Facility, drew $US5.5 billion ($A8.5 billion) in pledges on the

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