ScienceDaily: A new study led by the U.S. Geological Survey and involving the University of Colorado at Boulder and Oregon State University as well as other research institutes indicates tree deaths in the West’s old-growth forests have more than doubled in recent decades, likely from regional warming and related drought conditions. The study, published in the Jan. 23 issue of Science, documented tree deaths in all tree sizes in the West located at varying elevations, including tree types such as …