Many hotels promise to be green nowadays, but where can travelers find more information to help them choose the most eco-friendly hotel?

Online booking site Travelocity believes that travelers actually prefer green hotels -- according to its statistics, eco-friendly properties get higher reviews than their non-green counterparts.

For many consumers, search sites such as Travelocity, Expedia and Orbitz will be the first stop in booking a hotel and all three have tried to make it easier -- Travelocity lists more than 2,000 hotels in its Green Hotel Directory and refuses to accept "self-certified" hotels, forcing companies to provide their commitment to sustainability.