Method has succeeded where some other eco-brands have failed by solving a consumer problem using a greener product -- concentrated laundry detergent in smaller, more convenient jugs. "That was the first time we radically changed the format of a product," says co-founder Adam Lowry. "We had the idea that the No. 1 cause of consumer dissatisfaction at the time -- this was back in 2003 -- was the jug."

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