The largest manmade structure used to be the Great Wall in China, but now it is a landfill covering 3,000 acres on Staten Island in New York. The average American generates 4 pounds of garbage a day, and collectively that adds up to 180 million tons of solid waste per year. Where does it go? Nearly 75 percent of it goes to landfills, but space is running out. In 1990, the General Assembly asked communities to start recycling programs that would result in a 25 percent reduction in solid waste disposal.