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I read recently about a NASA generated (via 3 satellites using LIDAR) to generate a global scale map of forest height. This should, they say, be helpful in measuring the amount of carbon trees tack from the atmosphere. You can read the original posting at http://www.nasa.gov/topics/earth/features/forest-height-map.html. It is reprinted at sites such as treehugger.com and slashgeo. -- Bruce Ralston Professor Department of Geography University of Tennessee Knoxville, TN 37996-0925 Phone: 865-974-6043 FAX: 865-974-6025 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- To review the archives of CLUBGGY or Join/Leave the list go to: http://listserv.utk.edu/archives/clubggy.html