LAUREL McFADDEN struck a match and held it up to a nozzle on a giant tank. A small blue flame flickered into life, indicating that the mixture of mud, ground-up kitchen scraps and water inside the tank was generating methane.
In a warm climate, producing biogas in this way is no big deal. However, McFadden's demonstration took place in Alaska in near-freezing temperatures. The ability to make biogas under such conditions could be hugely significant in cutting reliance on fossil fuels in colder parts of the world.
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