Carrefour, the second largest retailer in the world, had just announced that it would open its first 'Green Store' in Beijing before the 2008 Olympic Games. David Monaco, asset and construction director of Carrefour China, had little experience with green building, and was struggling with how to translate that announcement into specifications for store design and operations. Monaco has to evaluate the situation carefully both from ecological and economic perspectives. In addition, he must take the regulatory and infrastructure situation in China into account, where no official green building standard exists and only few suppliers of energy saving equipment operate. He had already collected energy and cost data from several suppliers, and wondered how this could be used to decide among environmental technology options. Given that at least 150 additional company stores were scheduled for opening or renovation during the next three years in China, the project would have long term implications for Carrefour.