A range of firms like www.greenhotelcertification.com have sprung up to offer consulting packages that combine the environmental management aspects of greening hotels with marketing. From a quick review, it looks like "greening the hotel industry is principally focused on using the field of environmental management, e.g., physical environmental factors (energy, pollution, carbon, toxics, etc.). A particularly useful website for basic orientation and in-depth learning of applying environmental management to the hotel industry from an independent science-based organization is the following: www.yourhomeplanet.com/ecolodgical/index_ems.php. I highly suggest reviewing it.The larger arena and practice of sustainability includes (click here to open the document for full text).