With greenhouse gas emissions back at pre-COVID levels, the World Meteorological Organisation concludes average global surface temperatures for each year between 2024 and 2028 are predicted to be between 1.1 and 1.9 degrees warmer than the 1850 to 1900 average.

They find there is an 86% chance at least one of the next five years will be warmer than 2023, the previous warmest year on record globally.

"We are playing Russian roulette with our planet," said UN Secretary General Antonio Guterres.

"The battle to limit temperature rise to 1.5 degrees will be won or lost in the 2020s - under the watch of leaders today."

The warning comes as officials are gathered in Bonn, Germany, for an update on progress on international climate negotiations ahead of the COP 29 global climate summit in Baku, Azerbaijan, in November.

Global average temperatures for May 2024 were the highest on record, according to Copernicus.

The month was 0.65 degrees warmer than the average for May between 1991 and 2020. May 2024 was also the 12th consecutive month in which average temperatures were the highest ever recorded globally.

While the rise in global carbon emissions has slowed significantly in recent years, they have not yet peaked. And despite agreements reached at COP 28 in Dubai to triple the amount of renewable energy generated worldwide by 2030, the International Energy Agency (IEA) warned on Monday most countries are not yet on track to meet that target.

Current renewable energy deployment plans fall about one-third short of meeting the 2030 agreement.

The IEA estimates around 8,000 GW of renewable energy will be deployed worldwide by the end of the decade.

Wind and solar projects in China alone make up 3,180 GW of that total.