We talk to the author of Guns, Germs and Steel about his new book on nations in crisis. Jared Diamond argues that personal crises are a good way of thinking about national ones. He tells us about one of his own personal crises and we see whether the lessons really apply to politics. Plus we discuss what's gone wrong with political leadership in the US and we explore what it would take to tackle the global environmental crisis.
From the G7 to the Singapore summit, it's Trump's world: we just live in it. This week we try to get some perspective on these spectacular events. Is Trump's behaviour really unprecedented for an American president? What is the point of the G7? Where is his relationship with Kim heading? Plus we compare with summits past: Nixon in China, Reagan & Gorbachev, or something new? With Helen Thompson and Andrew Preston, who gives a Canadian view. Next week: Grenfell.