Mirror, mirror on the wall, who's the greenest of them all? Well, if you're in the retail sector the obvious answer to that is Wal-Mart. There was much skepticism initially of Wal-Mart's attempts to go green. Many believed its quest to reduce energy consumption, embrace rooftop solar systems and clean up its transport fleet was yet another attempt at feel-good marketing -- a bid to win over consumers who believed Wal-Mart was an evil retail monster aimed at taking over every small town in America. At the recent Cleantech Forum in Toronto, Rand Waddoups, senior director of corporate strategy and sustainability at Wal-Mart, admitted that the retailer's green strategy was initially adopted from a defensive posture. "We started by saying 'this could be a real problem for us, we need to understand how big of a problem this could be.' Over time, we realized this wasn't a problem, it was a real opportunity for us."