Giant of Carlisle, Pa., is celebrating Earth Day all month long. Kroger Co. launched an online contest encouraging recycling and sustainability. Whole Foods Market set Earth Day as the end of plastic-bag use at its store checkout lanes. Supervalu is sponsoring an Arctic expedition to raise awareness about global warming.
As sustainability becomes increasingly important to consumers, retailers have ramped up their efforts to show that they are in sync with shoppers' sympathies. Those e