First it was cloth diapers instead of disposables. Then the really eco-conscious started promoting washable cloths instead of toilet paper. And the latest rage? How about no-flush urinals?! Yes, according to McClatchy Newspapers, no-flush urinals are the fastest growing segment of the U.S. urinal market, having the support of no less than eco-champion Al Gore. But these waterless urinals, which rely on oil-filled drain traps, are proving to be “icky, sticky, and costly to maintain.” So it’s little wonder that major doubters now include the University of Washington and super-seller Wal-Mart, which both tested and then flushed the idea of no-flushers right down the drain.