For ages, cow's "excreta" traditionally have been used as manure in the fields, but it is also a source of viable energy- bio gas, which can reduce greenhouse emissions, significantly....read on..By capturing and storing CO2 from biogas into the ground, the biogas becomes carbon negative and scrubs our past CO2 emissions out of the atmosphere. Hooman may have some late nights partying until cows come home...but HERE he ventures out to the open pasture to examine this VERY important alternative energy source..first hand!!! even if you can't stand poo, you may want to view !!!