Three of the largest US window manufacturers, Andersen, Kolbe & Kolbe, and Jeld-Wen, are sending a mixed message about their commitment to the environment. They all offer some products using Forest Stewardship Council (FSC) certified lumber, the only independent forest certification. And yet, they continue to source from Sierra Pacific Industries, California's largest forest destroyer, for their wood window products. Tell Andersen, Kolbe & Kolbe, and Jeld-Wen it's time to green up their act. If they're serious about the environment, they must drop SPI from their supply chain until the company improves its practices.