A St. Louis native is taking discarded tires out of the state's ecosystem — and putting them onto his customers' feet.SLU High School and Mizzou graduate Tipper O’Brien set off out to turn discarded tires into sandals in an effort to help clean up Missouri. The resulting sandals, marketed as "
O’Brien works out of the basement of his Benton Park home to make and market Greendals, along with two of his friends.…