To counter climate denial, UN scientists must be 'clear' about human role: IPCC chief

James Skea, Chair of the Intergovernmental Panel on Climate Change (IPCC) poses during a photo session in Saint-Denis, in the outskirts of Paris, on December 4, 2025. [AFP]

With US President Donald Trump and other sceptics calling climate change a hoax, the UN's climate science body must tell the world in a "very clear way" that humans are heating the planet, its chairman told AFP.

Jim Skea, a Scottish professor, chairs the Intergovernmental Panel on Climate Change (IPCC), which held a five-day meeting in a skyscraper outside Paris this week to begin drafting the next major UN climate assessment.