Depends on what kind of pigs you use...bobhenstra wrote:Aaah, the Chinese are way ahead of us. They only need two pigs----
http://www.ruralpovertyportal.org/count ... ina/biogas" onclick="window.open(this.href);return false;
http://www.foxnews.com/us/2014/03/14/no ... -wild-hog/" onclick="window.open(this.href);return false;