Their tour bus runs on biodiesel fuel—which is derived from vegetable oil. The toilet paper, paper towels and tissues are all made of recycled paper. They've eliminated plastic utensils from the kitchen, and their silverware was purchased at a thrift store.
Sheryl and Laurie also work to eliminate "phantom power" on the bus. If any charger or appliance is left in an outlet, it continues to use power—even if it's turned off. "Not only are you using energy you don't need to be using, but it goes on your energy bill," Sheryl says.