Summary: <p>Dr. Murphy Westwood, director of <a href="http://www.mortonarb.org/science-conservation/global-tree-conservation" target="_blank" rel="noopener noreferrer">Global tree conservation</a> at the Morton Arboretum, and Dr. Rex Bastian from the <a href="http://www.davey.com/" target="_blank" rel="noopener noreferrer">Davey Tree Expert Company</a>, discuss the decline and possible extinction of several ash tree species, as well as threats to various types of oaks. </p> <p></p>
