
In 1975, John Denver released a wonderful song called "Aspenglow." Each stanza ended with the words, "Winter's gold, aspenglow." He was talking about the golden aspens that are known throughout Colorado, and while not the state tree, it is surely the most talked about.
But today the aspens are disappearing, another silent, subtle victim of climate change. Warmer temperatures have stressed the trees and now they are being attacked by four different parasites and one wasting disease. It isn't an isolated occurrence, according to Colorado authorities nearly 20 percent of the state's aspen groves and now afflicted.
Known as SAD, Sudden Aspen Decline, it is moving at an alarming rate. ""It's just rolling through the forests," Wayne Shepperd, an aspen specialist at Colorado State University, said of SAD.