Throughout the U.S., trees are dying at an astonishing rate. The reasons for the die-off vary from location to location -- drought, disease, insects and wildfires --…

Throughout the U.S., trees are dying at an astonishing rate. The reasons for the die-off vary from location to location — drought, disease, insects and wildfires –…

There is an eerie feel to this grove of lodgepole pines that I can't quite put my finger on as entomologist Diana Six tromps ahead of me,…