Just off the top of my head I can think of a few ways that hotels can save money and go "green" while doing it. For example, everyone knows that hotels do a lot of laundry, so why not invest in energy star laundry machines and dryers. Another easy thing to do would be to set the automatic thermostat a little higher, as they are always set for a cool 70...so why not 73 or 74, its not that much of a difference and saves money. The hotel can purchase a radiant barrier called HeatBloc-75. It is a film that goes on the roof and blocks up to 75% of the sun's rays resulting in less heat to cool down in summer months and a smaller energy bill. Anyways, if you care about the environment enough that when you see an advertisement for "green hotels", give it a try and let me know how the experience went. I will definitely do so myself if I stay in one in the future.