Heatwaves at both of Earth’s poles alarm climate scientists

A drop of water falls off an iceberg melting in the Nuup Kangerlua Fjord in south-west Greenland. Earth’s poles are undergoing simultaneous extreme heat. Photograph: David Goldman/AP

Startling heatwaves at both of Earth’s poles are causing alarm among climate scientists, who have warned the “unprecedented” events could signal faster and abrupt climate breakdown.

Temperatures in Antarctica reached record levels at the weekend, an astonishing 40C above normal in places.