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Biogas

​Biogas is a gaseous renewable energy source[1] produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste, wastewater, and food waste. Biogas is produced by anaerobic digestion with anaerobic organisms or methanogens inside an anaerobic digester, biodigester or a bioreactor.[2] The gas composition is primarily methane (CH

4) and carbon dioxide (CO

2) and may have small amounts of hydrogen sulfide (H

2S), moisture and siloxanes. The methane can be combusted or oxidized with oxygen. This energy release allows biogas to be used as a fuel; it can be used in fuel cells and for heating purpose, such as in cooking. It can also be used in a gas engine to convert the energy in the gas into electricity and heat.[3]

After removal of carbon dioxide and hydrogen sulfide it can be compressed in the same way as natural gas and used to power motor vehicles. In the United Kingdom, for example, biogas is estimated to have the potential to replace around 17% of vehicle fuel.[4] It qualifies for renewable energy subsidies in some parts of the world. Biogas can be cleaned and upgraded to natural gas standards, when it becomes bio-methane. Biogas is considered to be a renewable resource because its production-and-use cycle is continuous, and it generates no net carbon dioxide. From a carbon perspective, as much carbon dioxide is absorbed from the atmosphere in the growth of the primary bio-resource as is released, when the material is ultimately converted to energy.

​Yorkshire (/ˈjɔːrkʃər, -ʃɪər/; abbreviated Yorks), formally known as the County of York, is a historic county of Northern England and the largest in the United Kingdom.[3] Because of its great size in comparison with other English counties, functions have been undertaken over time by its subdivisions, which have also been subject to periodic reform. Throughout these changes, Yorkshire has continued to be recognised as a geographic territory and cultural region.[4] The name is familiar and well understood across the United Kingdom and is in common use in the media and the military,[5] and also features in the titles of current areas of civil administration such as North Yorkshire, South Yorkshire, West Yorkshire and the East Riding of Yorkshire.

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Within the borders of the historic county of Yorkshire are large stretches of unspoiled countryside, particularly within the Yorkshire Dales, North York Moors and Peak District national parks.[6] Yorkshire has been nicknamed "God's Own Country".[4][7][8]

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The emblem of Yorkshire is the White Rose of the English royal House of York, and the most commonly used flag representative of Yorkshire is the white rose on a blue field[9] which, after nearly fifty years of use, was recognised by the Flag Institute on 29 July 2008.[10] Yorkshire Day, held annually on 1 August, is a celebration of the general culture of Yorkshire, ranging from its history to its dialect.[11]

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Yorkshire is covered by different Government Office Regions. Most of the county falls within Yorkshire and the Humber while the extreme northern part of the county, such as Middlesbrough, Redcar, Holwick and Startforth, falls within North East England. Small areas in the west of the county are covered by the North West England region.