A complete list of hotels with the highest environmental standards appears in the November issue of the magazine that is published by American Express Publishing Corp.
Here is a list of their top 10:
* Spice Island Beach Resort, Grenada
The property's water is solar-heated, the bulbs are energy-saving compact fluorescent, and the pool is treated with salt instead of chlorine.
* Sonveva Fushi Resort & Six Senses Spa, Maldives
This collection of luxury villas has pledged to cut its greenhouse gas emissions in half by next year and achieve carbon neutrality by 2010.
* Tiamo, Bahamas
This solar-powered 11-bungalow hideaway uses less electricity a month than an average U.S. household. It also has a ban on unsustainably harvested seafood and a program to host visiting biologists.
* Whitepod, Switzerland
The geodesic domes at Whitepod's camp may be electricity-free, but they keep things cozy with plush organic bedding, sheepskin throws, and fireplaces fueled with sustainable harvested wood.
* Devil's Thumb Ranch, Colorado
With 16 airy timber cabins and a soon-to-open lodge, each heated and cooled entirely with fireplaces, only one percent of this 5,000 acre ranch has been developed, leaving the rest free for guests -- and elk, moose, bears, and beavers -- to roam.
* Chumbe Island Coral Park, Zanzibar, Tanzania
Designated 13 years ago as Tanzania's first managed marine protected area, the park is one of the region's most diverse reefs. A ranger program educates locals about marine ecology and prevents illegal fishing, while Chumbe's rooftop rainwater-collection system and solar-powered lights keep the resort in harmony with nature.
* Adrere Amellal, Egypt
As part of the Siwa Sustainable Development Initiative, the hotel helps to fund and support numerous community projects, including measures designed to encourage sustainable farming.
* Campi Ya Kanzi, Kenya
The lodge and its foundation employ 160 tribespeople and make a daily $40-per-guest donation to support new schools, scholarships and compensation payments to Masai for lost cattle.
* Hotel Mocking Bird Hill, Jamaica
The hotel relies almost exclusively on local suppliers, such as the women's group that transforms discarded paper into stationery for guests. Water is collected in rain tanks, laundry is dried in the sun, and the resort's ENOUGH program raises money and supplies for island schools.
* Tenuta Di Spannocchia, Siena, Italy
This 1,100-acre organic estate of managed forests, vegetable gardens and hiking trails is dedicated to preserving the region's cultural and agricultural legacy.