Smog has been a persistent problem for much part of China.This is largely due to China's energy consumption pattern, where coal is being used on a massive scale to produce electricity, steel and cement.In China's big cities like Beijing, vehicle emissions have also played a major role in contributing to the smog issue in addition to coal.Beijing triggered its first ever red alert this winter, putting half of its cars off the road based on an odd-even car plate number system.So how can China reduce emissions from energy consumption?What can Beijing do, in particular, to improve air quality?