The president of the UN's COP28 climate talks urged negotiators to compromise on Sunday, warning "failure is not an option" as efforts to reach a deal on phasing out fossil fuels met resistance from top oil exporter Saudi Arabia.

The host of the United Nations' COP28 climate summit cast doubt on whether eliminating fossil fuels would limit global warming to 1.5 degrees Celsius.

Humanity will bring about its own "terminal decline" if governments fail to trigger the end of the fossil fuel era at COP28, the United Nations climate chief has warned as the summit opened. With tens of thousands of people flocking to Dubai for two weeks of frantic deals and negotiations,

UN climate talks negotiators were under growing pressure on Sunday as the deadline nears to strike a new global deal aimed at keeping global warming within 1.5 degrees Celsius.

The UN climate chief has urged an end to obstruction a day before the deadline for a deal at a summit in Dubai, with oil producers resisting historic calls for the world to wind down fossil fuels.