CEO Lee Scott said that Walmart's goal was to be a "good steward of the environment" and ultimately use only renewable energy sources and produce zero waste.[50] The company also designed three new experimental stores with wind turbines, photovoltaic solar panels, biofuel-capable boilers, water-cooled refrigerators, and xeriscape gardens.[51] In this time, Walmart also became the biggest seller of organic milk and the biggest buyer of organic cotton in the world, while reducing packaging and energy costs.[49] In 2007, the company worked with outside consultants to discover its total environmental impact and find areas for improvement.