“Did not the plains indians burn buffalo chips?”
I have read where pioneers in wagon trains, on much used routes, would fight over the buffalo chips and cow pies etc.
Too many people had already picked up all the wood.
Much of the great plains had virtually no wood. Still today you can see thousands of limestone fence posts along the hiways in Kansas.
They key here is that it was dried out. Thats part of the problem with biomass producing energy. The amount of energy it takes to dry it so it can burn is greater than the energy output of the now dry mass.
If its producing methane gas, a comparable example would be the LA city or county WWTP. It produces enough methane each day that burning it through their energy plant basically allows it to be energy neutral in that it produces enough energy to offset its use of energy.