"In just a few decades, China will have switched from raising pigs in backyards to raising them in massive factory farms
Just as staggering as the rise of the Chinese pork industry is the speed at which it has embraced industrial pig farming. The number of hog farms dropped 70 percent between 1991 to 2009. Over the same period, the average hog farm grew from 945 head to 8,389 head."
