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Stephen Sackur speaks to environmental historian and author Jared Diamond. There鈥檚 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鈥檚 hugely successful big picture explanations of the way human societies developed draw on biology, geography, anthropology and more. So what鈥檚 his conclusion about the long term viability of homo sapiens?