Natural Archives, Changing Climates Ray Bradley from the University of Massachusetts discusses paleoclimatology and the importance of preserving climate records. Dr. Bradley's engaging and informative public lecture was part of AGCI's Walter Orr Roberts Memorial Public Lecture series. Bradley was one of 30 scientists who gathered in Aspen for a week-long workshop to dicuss North American Climate Extremes. DVD Viewing Time: 1 hour, 7 minutes $39.95 plus S & H (8.6% sales tax applies in the State of Colorado) Please allow 1-2 weeks shipping