Scientists think the main system of currents in the Atlantic Ocean - known as AMOC - may be weakening. How will that impact our climate?

Professor Penny Holliday is the Chief Scientific Officer at the UK's National Oceanography Centre. She joins Graihagh Jackson and Esme Stallard in the studio to discuss her many years studying the strength and variability of AMOC.

Producers: Graihagh Jackson, Diane Richardson and Grace Braddock Sound Mix: Dafydd Evans and Tom Brignell Editor: Simon Watts

Photo by Joe Klamar / AFP via Getty Images