"A government policy to promote coal use in Northern China has cut the life expectancy of some 500 million people by more than five years, on average." User amaxen, in the Reddit as it is meant to be subreddit, 08 Jul 2013
"A government policy to promote coal use in Northern China has cut the life expectancy of some 500 million people by more than five years, on average." User amaxen, in the Reddit Science subreddit, 08 Jul 2013