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Jon Pelletier, a UA professor of geosciences, walks through the forest on Cerro del Medio, a mountain in New Mexico’s Valles Grande, after the 2011 Las Conchas fire. (Photo: Caitlin Orem) Jon Pelletier, a UA professor of geosciences, walks through the forest on Cerro del Medio, a mountain in New Mexico’s Valles Grande, after the 2011 Las Conchas fire.