Some 600 experts gather outside Paris on Monday to start work on the next major UN climate report, as the international consensus on global warming is challenged by climate change-sceptic US President Donald Trump.

The previous report by the Intergovernmental Panel on Climate Change (IPCC), released in 2023, had warned that the world was on track to breach the 1.5C warming threshold by 2030.

The United Nations now says the planet is set to breach the limit earlier than feared -- a line that, if crossed, could unleash devastating storms, floods and droughts.

Experts from more than 100 countries are meeting in a skyscraper in Saint-Denis for five days, launching a process that will culminate with the IPCC's Seventh Assessment Report (AR7), due to be published in 2028 or 2029.

It brings t

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