The "greenest" accommodations in the world (with average nightly rate), from TripAdvisor.com:

1. Jean-Michel Cousteau Fiji Islands Resort, Vanua Levu ($617)

2. Lapa Rios Ecolodge, Osa, Costa Rica ($420)

3. Post Ranch Inn, Big Sur, Calif. ($871)

4. Inkaterra Machu Picchu, Peru ($616)

5. Concordia Eco-Tents, Salt Pond Bay, St. John, U.S. Virgin Islands ($515)

6. Daintree Eco Lodge, Daintree, Australia ($404)

7. Hotel Punta Islita, Playa Samara, Costa Rica ($229)

8. Lodge at Chaa Creek, San Ignacio, Belize ($170)

9. Inn by the Sea, Cape Elizabeth, Maine ($275)

10. Hotelito Desconocido, Puerto Vallarta, Mexico ($417)