AUSTIN , Texas , April 6 / PRNewswire-FirstCall / -- One year after Whole Foods Market ( Nasdaq : WFMI ) became the first U.S. supermarket to eliminate disposable plastic grocery bags at all of its store checkouts , the Company announces that it has seen the amount of reusable bag use triple and that the natural and organic grocer has kept an estimated 150 million plastic bags out of landfills since last Earth Day .