Brazil's Luiz Inacio Lula da Silva received a superstar welcome at the COP27 summit in Egypt as he pledged to recommit the rainforest nation to tackling the climate crisis and offered to hold future UN climate talks.
"I'm here today to say that Brazil is ready to come back," Lula said on Wednesday, drawing cheers from the crowd of delegates at the international climate summit in the seaside resort town of Sharm el-Sheikh.
Lula won the presidential election last month against right-wing President Jair Bolsonaro, who presided over mounting destruction of the Amazon rainforest and refused to hold the 2019 climate summit originally planned for Brazil.
Lula, a former president who is due to start his third term in January, told delegates he would seek to make Brazil the host of COP30 in 2025 and would aim to put the venue in the Amazon rainforest, rather than the more populous coastal region.
The Amazon, the world's largest rainforest spanning more than six million square kilometres, absorbs vast amounts of greenhouse gas, which if released would blow global climate targets.
"There is no climate security for the world without a protected Amazon," he said, explaining he wanted people to see the region. "We will spare no efforts to have zero deforestation and the degradation of our biomes by 2030."
The standing-room-only crowd included two former Brazilian environment ministers, legislators, state governors, activists and indigenous in traditional headdress. COP27 President Sameh Shoukry of Egypt escorted Lula to the stage.
Lula emphasised that climate change could only be addressed hand-in-hand with social justice, with the crowd applauding his pronouncements on ending inequality and improving conditions for natives people.
He also slammed global leaders for failing to prioritise climate change, saying they had ignored warnings about the plight of the planet while spending trillions of dollars on war.
"The planet is at every moment alerting us that we need one another to survive," he said.
"However, we ignore these alerts. We spend trillions of dollars on wars that bring destruction and death, while 900 million people in the world don't have something to eat."
Lula added that he was calling on rich nations to deliver on their past pledge to provide $US100 billion ($A148 billion) a year to poor countries to help them adapt to climate change and reduce greenhouse gas emissions.
It was his second speech at the conference on Wednesday, both of which were thronged by admirers chanting "Lula! Lula!" and shaking the conference venue walls with their cheers.
Lula's choice to make the COP27 summit the focus of his first international visit since being elected has helped to energise this year's talks.
His policies are diametrically opposed to his predecessor Bolsonaro, who appointed climate sceptics as ministers and saw deforestation in Brazil's Amazon rainforest spike to a 15-year high.
Lula had reduced deforestation to near-record lows in his first presidency from 2003 to 2010.
For his new administration, he has promised a sweeping plan to restore environmental law enforcement that eroded under Bolsonaro and create green jobs.