Our correspondent travels to the border of the locked-down Hubei province, finding among the people a mixture of resignation, fear and distrust. Was the draconian response appropriate? Big oil firms have just the kind of expertise needed to make a vast transition to renewables; in order to survive, they should put it to use. And why Mongolia’s winters are growing deadlier. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer