A growing number of environmentally-minded poultry farmers in the United States, Canada and Australia are looking to peck away at their greenhouse gas emissions by transforming chicken dung into biochar fertilizer, as well as biogas and a form of bio-oil that can be used to run f …

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Researchers hoping to ease America's oil addiction are turning sawdust and wood chips into bio-oil, a thick black liquid that could become a green substitute for many petroleum products.

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