Want to really go green? Then patch up that rickety marriage. Researchers at Michigan State University have found that between 2001 and 2005, divorced households in the United States used 61 percent more land, 42 percent more water, and 53 percent more energy per person than married households. If divorced households had stayed together, the country would have saved 73 billion kilo-watt-hours of electricity and 627 billion gallons of water in 2005 alone.