Companies are popping up left and right to help travelers looking for ways to reduce their environmental impact. Two brand-new sites are WholeTravel.com, which lists and ranks ''green'' hotels and activity outfitters (e.g. horseback riding, white-water rafting) and VroomVroomVroom.com, a rental car booking site boasting both low prices and low guilt factor: The company donates carbon offsets for every rental. These sites join RezHub.com, which launched last fall and helps travelers find environmentally-friendly hotels, activities, hybrid rental cars and flights (via carbon offsets).

















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