The world depending on the fossil fuels will eventually end and at that time other alternative energy sources will have to replace them. One of them could be biogas. The advantages of biogas are its simplicity in producing it as there is plenty of sources you can produce it from.
The process requires some form of organic material which is decomposed and make into a fertilizer while the gases are caught by the gas plant. Since meat production on Earth will probably only increase with the increase in standard in developing countries we will build more farms which will produce plenty of manure and dung. This will be a cheap and plentiful resource for biogas production that will also give a fertilizer.
The natural biogas can be used for many things, for heating buildings, powering power plants or even for powering machinery. All currently existing engines can run on refined biogas with a small readjustment. While the cost of readjusting all the engines right now would be very high it can happen in case of high increase of oil prices, which is always a possibility. The disadvantage to this is the need to refine all raw biogas and refinement costs a lot of money. Logistics can also be a problem, because the organic decomposition leaves bad odor the biogas digesters have to be built in remote areas away from populated zones. Because it is very unlikely that companies will build a pipeline for biogas all of it will have to be transported by trucks.
The most useful application at the moment seems to be the use of city sewage for biogas production and then using the gas for heating the apartment buildings. In time when we develop better technologies for more energy efficient burning of biogas this could become very widespread. Since the cities are an unlimited resource of bio materials and the consumer of the heating is also very close this is most commonly used methods of biogas usage. In many developed countries like Sweden they already have modern, high capacity biogas digesters for widespread use and production of biogas. Since this technology will only improve over time we can expect to see similar systems put in place all over the world.
Here is a quick video showing how they are building biogas digesters for farms.
There is also the occurrence of small, one household biogas digesters which work on a smaller scale, but require very little investment with possible unlimited benefits. Since the technology used is fairly simple, if you buy a biogas burner to heat your home you can easily save some money and a lot of people are already doing it. People who are a bit more green oriented and are not scared by a small construction challenge are perfect candidates for this kind of project. You can find many small biogas digester plans online, like the Liberty generator which shows you how to use gas and turn it into electricity. You can get more information about it. Is Liberty generator scam or not?
Additional benefits of biogas are that when it burns it leaves very little emissions into the atmosphere, far less than the unburned methane that is produced in the uncontrolled decomposition. Leaving organic material to bacteria and worms has a bigger greenhouse affect than if we make biogas from it. With increasing importance of keeping our environment clean governments might offer subsidies to alternative green energy sources like biogas, this way the technology will gain in prominence and become an important part of our energy self-sustainability. Check out liberty generator testimonial for a detailed explanation of how you can use this technology yourself.