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T Shelley, Green technologies hit fast forward, Eureka, November 2010, p 10

In the CNG world, interest is growing in the biogas generated from fermented municipal waste which contains approximately 60% methane compared with 95% in natural gas, and a process patented by the Indian Institute of Technology raises the 60% to 95% feeding an increasing number of indigenous vehicles. Biogas Products based in UK supply equipment to produce biogas, and scrub it from hydrogen sulphide.

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