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Tuesday, Feb 26, 2013 - 8:00 AM    "Of Drought and Fire" Within the last three decades there have been large wildfires consuming the forests in nearly all the mountain ranges above the desert southwest. Just below the ranges, the lack of rains combined with invasive species has caused additional wildfires that have devastated portions of the Sonoran Desert. The link between drought and fire has pre-historic roots and host David Yetman and Tom Swetnam from the University of Arizona's Laboratory of Tree-Ring Research travel through the desert to higher elevations that contain evidence of drought, fire, and civilization. D
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