Gary Chastagner, a Washington State University professor called "Dr. Christmas Tree" shows an example of a less-desirable tree due to fewer top branches, grown in a small plantation of Turkish fir trees to produce disease and insect-resistant Christmas trees at the school's Puyallup Research and Extension Center on Thursday, Nov. 30, 2023, in Puyallup, Wash. Chastagner has been working with breeders to see if species from other parts of the world — for instance, Turkish fir — are better adapted to conditions being wrought by climate change. (AP Photo/Jason Redmond)