Many organic materials can release gases, due to metabolisation of organic matter by bacteria (anaerobic digestion, or fermentation). Landfills actually need to vent this gas to prevent dangerous explosions. Animal faeces releases methane under the influence of anaerobic bacteria.
Also, under high pressure, high temperature, anaerobic conditions many organic materials such as wood can be gasified to produce gas. This is often found to be more efficient than direct burning. The gas can then be used to generate electricity and/or heat.
Biogas can easily be produced from current waste streams, such as: paper production, sugar production, sewage, animal waste and so forth. These various waste streams have to be slurried together and allowed to naturally ferment, producing methane gas. This can be done by converting current sewage plants into biogas plants. When a biogas plant has extracted all the methane it can, the remains are sometimes better suitable as fertilizer than the original biomass.
Alternatively biogas can be produced via advanced waste processing systems. These systems recover the recyclable elements of household waste and process the biodegradable fraction in anaerobic digesters.
Renewable natural gas is a biogas which has been upgraded to a quality similar to natural gas. By upgrading the quality to that of natural gas, it becomes possible to distribute the gas to the mass market via the existing gas grid.' (http://en.wikipedia.org/wiki/Renewable_energy)
Threats Addressed Edit
(Insert links to threats this solution addresses)
(Insert benefits or valuable aspects of the solution) Only 5-10% of the organic compounds are converted to biomass. The rest has become biogas.
less biodiversity- more maize produced, land is cut back by this
waste released into rivers
faeces may not have been treated properly-infections
danger of explosion or leakage
(Insert links to specific product types and/or brands)
(Insert resource links here)