Yale Environment 360: Numerous plant species on a mountain in the southwestern U.S. are migrating to higher elevations as the climate gets warmer and drier, according to a new study. After comparing the results of a recent survey of 27 plants found on Mount Lemmon, a 9,157-foot peak near Tucson, Ariz., with a similar survey conducted in 1963, researchers at the University of Arizona found that three-quarters of the plants have shifted their range significantly upslope in the last five decades. In some cases, researchers...