A costly health problem facing countries all over the world - petroleum contamination of groundwater - could soon be tackled by armies of the world's tiniest inhabitants turning toxic waste into green electricity. Australia alone has some 120,000 contaminated groundwater sites of the world's estimated 5 million sites. These are a legacy of petrol, diesel and other hydrocarbons that have leached into the ground from old service stations, fuel dumps and factories, and often remain polluted long after the redevelopment of the land, posing a health risk to current and future residents...

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