Largest El Niño in living memory?

Weather experts describe the developing climate system as an unprecedented event. Temperatures in the Pacific Ocean could climb more than three degrees above normal.

Also in the programme: the Facebook whistleblower Frances Haugen speaks to Newshour about the legal case against Facebook's parent company for improperly collecting and using children's personal data; and dramatising the colourful life of the British economist John Maynard Keynes.

(Photo: Mexico says mass bird deaths likely caused by El Nino's hotter waters. Credit: Mexican Government/Handout via Reuters)