Reuters: The move to more sustainable, earth-friendly clothing, shoes and other consumer goods may be at a "tipping point" of mainstream acceptance, and major companies like Nike Inc and eBay Inc are recognizing their growing importance among global shoppers. Green is now a major marketing tool, with companies from British Petroleum advertising alternative energy to Wal-Mart Stores Inc’s offering more organic goods. Moreover, the green movement is no longer the exclusive domain of the …