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General Motor's Lansing Delta plant in Michigan produces the Buick Enclave, GMC Acadia, and Saturn Outlook. The state-of-the-art facility was built in 2006 and employs 2,800 people. The plant collects rainwater on its roof and uses it to flush toilets--one of the environmentally friendly practices that has made it the only auto plant in the world to earn gold-level certification with the Leadership in Energy and Environmental Design (LEED) green building rating system.