The US warns Israel over Gaza aid: how does diplomacy differ in public and private?

A letter from the US gives Israel 30 days to boost humanitarian-aid access to Gaza, we ask: how big is the difference in tone of public and private diplomacy? Also in the programme: we reflect on the Shanghai Cooperation Organisation summit in Islamabad and assess the latest cuts to the BBC. Plus: a Californian university has a new graduation requirement – a course on climate change.See omnystudio.com/listener for privacy information.