Some might describe them as the "perfect biofuel" because methanogens can make methane from CO2 and water with the help of a little spark.Pop Sci.com reports:
"The technology is still experimental, but late last year researchers at Penn State University discovered how to make methane — a main ingredient in natural gas — from the very thing driving climate change: carbon dioxide. The key is microorganisms called methanogens. Engineer Bruce Logan discovered that the organisms produced methane with nothing but water and carbon dioxide when zapped with an electric current." See article.
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