A worker stocks a new Walgreens store in Chicago(Reuters) – Walgreen Co is getting behind the "green" part of its name, because it objectives to build what it believes would be the first retailer in america to provide at the least as much vitality because it consumes. The biggest U.S. drugstore chain is preparing to construct the "internet zero power" store in Evanston, Illinois, not up to 20 miles from its headquarters in Deerfield, Illinois. That place gives quite easy access for its engineers to measure the store's performance. From building outlets with recycled supplies to investing in solar energy, a bunch of U.S. …