COP27: 'Life of the planet' at stake in climate crisis, says Biden

President Joe Biden told the COP27 conference Friday the "very life of the planet" is at stake in the climate crisis as he gave an assurance that the United States is on track to slash carbon emissions.

"The climate crisis is about human security, economic security, environmental security, national security and the very life of the planet," he told an audience at the conference in Egypt.

Biden said the United States is "on track" to achieve its pledge of cutting emissions 50-52 per cent below 2005 levels by 2030.

"The United States will meet our emissions targets," he said, laying out major legislation passed under his presidency, including the largest ever US government investment in clean energy.

Biden, who was spending only a few hours in the resort of Sharm El Sheikh before travelling on to ASEAN and G20 summits in Asia, challenged other countries to do more to cut carbon emissions in the hope of bringing global warming under control.

"Every nation needs to step up. At this gathering, we must renew and raise our climate ambitions," he said in a speech that lasted about 22 minutes and was briefly interrupted by unidentified people in the crowd making howling noises.

"Reality," he said.