I do a lot of backpacking in the Sierras, and last year I went to Colorado for the first time. The number of trees there that are standing-dead from pine borer

I do a lot of backpacking in the Sierras, and last year I went to Colorado for the first time. The number of trees there that are standing-dead from pine borer beetles is staggering. It looked to be about 1/3.