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Does travel have to be bad for the environment? Does eco-tourism really help the planet -- or just hurt it less? What's an ethical traveler to do? On this week's Travel with Rick Steves we'll discuss the goals and impacts of eco-tourism with Jeff Greenwald of of Ethical Traveler dot org, and ponder the future of some noteworthy "Vanishing Places" on our planet with travel writer Michael Shapiro. For more information on Travel with Rick Steves - including episode descriptions, program archives and related details - visit www.ricksteves.com.