Climate change activism

A schoolgirl climate activist in New York tells us why she took part in Friday's global day of action.

Also in the programme: The US is sending hundreds of troops to Saudi Arabia to protect its oil fields from another attack. US defence secretary, Mark Esper, says it's a signal to Iran.

Joining Julian Worricker to discuss these and other issues are Loretta Napoleoni, Italian-born author and economist, and David Robert Grimes, Irish cancer researcher, physicist and science writer.

(Image: The Swedish climate activist, Greta Thunberg, in lower Manhattan, New York. Credit: Reuters)