Yale Environment 360: The life expectancy of people living in northern China is 5 ½ years less than in southern China as a result of the north's notoriously bad air pollution, largely due to the burning of coal, according to a new study. In an analysis of air quality recordings from 90 Chinese cities from 1981 to 2000 and mortality data from the 1990s, a team of researchers estimated that high air pollution will cost the roughly 500 Getty Images million people living north of the Huai River a combined 2.5 billion...