As production of the fuel-efficient 2012 Chevrolet Sonic and Buick Verano begins this fall at the General Motors Orion Assembly Plant, 40 percent of the energy required to build the vehicles will come from burning gas from a nearby landfill - GM announced Thursday, May 19, 2011 in Lake Orion, Michigan. The use of the landfill gas, which saves GM $1.1 million a year in energy costs, also cuts the amount of greenhouse gases, sulfur dioxide and nitrogen oxides released in the air. (Photo by Steve Fecht for General Motors)