Annette Young meets with Christiana Figueres, the former UN climate chief, who has now joined the race to become the next UN Secretary-General. She talks of how in an increasingly polarised world, the need for collaborative diplomacy is needed more than ever.

In the running: Christiana Figueres enters race for UN Sec-Gen post

Annette Young meets with Christiana Figueres, the former UN climate chief, who has now joined the race to become the next UN Secretary-General. She talks of how in an increasingly polarised world, the need for collaborative diplomacy is needed more than ever.