Xiaonan Tai, University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States, Paul D Brooks, University of Utah, Geology and Geophysics, Salt Lake City, UT, United States, William Anderegg, University of Utah, School of Biological Sciences, Salt Lake City, UT, United States, Marcy E Litvak, University of New Mexico, Biology, Albuquerque, NM, United States and Jon Chorover, University of Arizona, Environmental Science, Tucson, AZ, United States