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Another way to use waste: a California start-up plans to test a mobile wastewater biorefinery that turns sewage sludge into a biodegradable plastic.
Biofuel interest wanes while efficiency in size and material, and cleaning the environment takes root as winning trends in the annual contest.
Leading competition for environmental start-ups awards company with a platform for maintaining desired home temperature more efficiently.
Winning proposals in this year's green tech start-up funding competition offered low-cost options for consumers.