Extreme heat already kills millions. New research shows how today’s emissions choices will determine how many more may face dangerous heatwaves this century.

The UAE and Saudi Arabia have long been at odds over oil policy. The latest move is also likely to further their broader regional rivalry.

Chimps build a new nest every night – but how they choose what to build and where is surprisingly complicated.

Pope Leo’s papacy is still a work in progress, but the American-born pontiff has so far emphasised unity in a fractured church – and world.