Yale Environment 360: The fate of a tree planted at poet Emily Dickinson's home raises questions about whether gardeners can -- or should -- play a role in helping plant species migrate in the face of rising temperatures and swiftly changing botanical zones. On rare occasions, the townsfolk of Amherst, Massachusetts, would catch a glimpse of a ghostly figure dressed in white, leaning over to tend her flowers by flickering lantern light. The mysterious recluse, who was better known to neighbors for her exquisite garden...