Successful arms-control diplomacy has kept proliferation at bay for decades. But many states now have nuclear ambitions; we look at an increasingly worrying shift. Rapid development in sub-Saharan Africa has led to a “double burden” of malnutrition: obesity is skyrocketing even as undernourishment continues. And the riches and the tensions to be found at a Greenland rare-earth-minerals mine. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer