In response to your good article ("Ecotourism: It's not that easy being green," Aug. 5, Page H-1), I wish to add to your list of Earth-friendly tour organizations an outfit which is superb in conducting a wonderful experience: Natural Habitat Adventures (www.nathab.com). They feature a large variety of great tours (United States and worldwide) and are a "conservation travel provider" for World Wildlife Fund — one of our premier conservation groups. Of the many companies I've toured with, they offer the very best in viewing pleasure combined with creature comfort. For example, during a recent tour of Canyonlands, while at the north rim of the Grand Canyon we were treated, at an early hour, to coffee in our cabin, then a terrific surprise white-tablecloth breakfast at a remote viewing spot. I strongly recommend this organization.