Every four years, at the start of a new administration, American intelligence agencies put out “Global Trends,” a weighty assessment of where the world seems headed over the next two decades. The latest report, Global Trends 2040, released last month by the National Intelligence Council, finds a changing climate, ageing populations, disease, financial crises and technologies that divide more than they unite, all straining societies and generating “shocks that could be catastrophic.” In this podcast the geopolity looks at the world, US intelligence envisage in 20 years.