The good news? A new study out today ranks St. Louis as the 21st least-wasteful city in the United States. The bad news? The study surveyed just 25 metro areas.Though our city finishes near the bottom in 23 categories, we do love our leftovers (we rank third in re-eating previous meals). Somehow, though, we rank dead-last in re-using Ziploc bags and tinfoil, two left-over staples. But, then, who wants to re-use a Ziploc bag anyway?More survey results after the jump...