China used more cement in 3 years than the U.S. did in the entire 20th Century
I wonder how much was used to build their ghost cities: 
<a href="http://www.businessinsider.com/chinas-ghost-cities-in-2014-2014-6" rel="nofollow">http://www.businessinsider.com/chinas-ghost-cities-in-2014-2...</a>