Jared Diamond

Stephen Sackur speaks to environmental historian and author Jared Diamond. There is a basic human impulse to better understand the world we live in. It motivates scientists, economists, historians and the like to seek out patterns and connections. Jared Diamond's hugely successful big picture explanations of the way human societies developed draw on biology, geography, anthropology and more. So what's his conclusion about the long term viability of homo sapiens?