From one of the world’s great geopolitical analysts, a terrifying glimpse of the none-too-distant future, when climate change will force the world’s powers into a desperate struggle for advantage and even survival.Dwindling resources. Massive population shifts. Natural disasters. Spreading epidemics. Drought. Rising sea levels. Plummeting agricultural yields. Crashing economies. Political extremism. These are some of the expected consequences of runaway climate change in the