As these mutualistic societies grow, I expect them to adapt and move into other ecosystems.
Electricity From Grass, Manure, And Organic Waste: Evonik Setting Its Stakes On Eco-Friendly BiogasTo make biogas flow, you need to have billions of "workers". The "workers" in this case are actually countless bacteria. They convert the biomaterial into methane, the fuel that powers the combined heat and power (CHP) plant of a biogas unit like the one Evonik Industries AG operates in Karstädt. Here, the biogas unit runs on manure and organic waste. From a neighboring dairy farm, the manure is piped underground to the unit. Road tankers and other trucks bring organic waste — such as frozen food products that have fallen out of the distribution chain, or residues from biodiesel production — to the facility. It takes enormous expertise to run a biogas plant. The bacteria require conditions that call for a certain composition of biomaterials. „Too much fat and alcohol aren‘t good for bacteria, either," says Christina Schumann, a chemical engineer employed at the biogas facility. If the bacteria are properly tended to, they work extremely hard. In just one hour, they produce 500 cubic meters of gas from manure and organic waste, which is all the facility‘s gas buffer tank can hold at one time.
http://www.electricnet.com/article.mvc/Electricity-From-Grass-Manure-And-Organic-0001 Carbon-Negative Biofuels from Low-Input High-Diversity Grassland Biomass Biofuels derived from low-input high-diversity (LIHD) mixtures of native grassland perennials can provide more usable energy, greater greenhouse gas reductions, and less agrichemical pollution per hectare than can corn grain ethanol or soybean biodiesel. High-diversity grasslands had increasingly higher bioenergy yields that were 238% greater than monoculture yields after a decade. LIHD biofuels are carbon negative because net ecosystem carbon dioxide sequestration (4.4 megagram hectare–1 year–1 of carbon dioxide in soil and roots) exceeds fossil carbon dioxide release during biofuel production (0.32 megagram hectare–1 year–1). Moreover, LIHD biofuels can be produced on agriculturally degraded lands and thus need to neither displace food production nor cause loss of biodiversity via habitat destruction.
http://www.sciencemag.org/cgi/content/short/314/5805/1598 Biogas potentialThe total biogas potential of digestion of domestic residual
products in Sweden is 10.6 TWh/year. This is equivalent to
12% of the energy consumption attributable to road transport.
The potential for biogas produced from the combustion of
residual products from the forest industry in Sweden is estimated
to be 59 TWh/year. One of the advantages of biogas is
that waste and residual products are used. It is also a domestic
fuel which is produced locally and the process does not involve
any competition with food production.
In total, biogas can replace more than half of all petroleum and
diesel used in Swedish road transport.
http://www.businessregiongoteborg.com/download/18.3b74207e11cacd3cffe80008819/biogas_b2b_eng_low-res.pdf