Colombia, Venezuela launch COP27 call to save Amazon

"We are determined to revitalise the Amazon rainforest in order to offer humanity a significant victory in the battle against climate change," Petro said at the UN summit in the Egyptian resort of Sharm el-Sheikh.

"If we, in the South Americas, carry a responsibility, it is to stop the destruction of the Amazon and put in place a coordinated process of recovery," Maduro said, speaking alongside Petro and the president of Suriname, Chan Santokhi.

Key to any such revival plan will be the newly elected Brazilian President Luiz Inacio Lula da Silva, widely known as Lula, who will take up his post on January 1 and is expected to attend COP27 next week.

The participation of Brazil in such a planned alliance will be "absolutely strategic", Petro said.

Leftist Lula faces an immense challenge in putting a brake on Amazon deforestation, a phenomenon that rapidly proliferated under his right-wing predecessor Jair Bolsonaro.

Petro, architect of the proposed new alliance, has called for the US to collaborate, noting that it is "the country that pollutes the most" on the American continent, while the south of the landmass is "the sponge that absorbs the most carbon dioxide on the continent".

He advocated "the opening of a fund" fed by "the contribution of private companies and world nations".

Petro had announced the previous day that his country intends to set aside $200 million per year over the next two decades to protect the Amazon.

He urged solidarity from international organisations, at a time when the COP has put the issue of compensation for damage caused by global warming on its agenda, despite resistance from developed nations.

"One of the subjects which could bring consensus between us, Africa and part of Asia is (a mechanism for) forgiveness of (national) debt as a means of financing action" against climate change, Petro said.

The International Monetary Fund would have "a role to play" in working with developing countries on this issue, he added.