Boading, dubbed China's 'greenest city', is the world's biggest maker of solar panels and wind turbines, write Caleb Goods & Carla Lipsig-Mumme. But it's also has the country's worst pollution. Green energy, electric cars and the batteries that power them are great, but with the heavy toxic footprint they carry from mine to factory, we must not delude ourselves that they are 'sustainable'.
