Reading in the Economist last month, I ran across the surprising fact that over the previous 100 years the United States consumed a whopping 4.4 gigatons of cement. Meanwhile, during the three years between 2011-2013, China consumed 6.4 gigatons of cement, 45% more than we did during the last 100 years. According to economist Elliot Eisenberg, the reasons lie in China’s vastly larger population, and concrete-based building methods, whereas we use a lot of wood.