Art Bell sits down with Dr. Roy Spencer, a principal research scientist at the University of Alabama in Huntsville and former NASA senior scientist, for a detailed examination of the global warming debate. Spencer acknowledges that at least half of recent warming is likely attributable to human activity but argues that climate models overestimate the sensitivity of the system to carbon dioxide, possibly by a factor of two or more. The discussion covers the dispute between Spencer and NASA… Full show notes & guests: https://artbellarchive.org/episode/march-3-2006-climate-change-and-open-lines-dr-roy-spencer