Posts Tagged ‘mountain pine bark beetles’

Global Warming: A Doubling of Tree Deaths

Sunday, January 25th, 2009

More bad news: According to a new study published in the current issue of Science, tree deaths in old-growth forests throughout the American West have more than doubled in recent decades. During the past decade, for example, mountain pine bark beetles have killed roughly 3.5 million acres of lodgepole pine forests in northwestern Colorado, and spruce bark beetles have also killed large areas of spruce forest in northern and southwestern areas of the state.

The study’s authors ruled out a number of possible reasons for the increasing die-offs, including air pollution, long-term effects of fire suppression, and normal forest dynamics, while concluding that regional warming and related droughts were the likely causes. Scarier still is their speculation that these deaths could lead to a series of harmful “cascading effects” on wildlife, and even more carbon dioxide in the atmosphere as there are fewer trees to absorb it and as the dead trees decaying on the forest floors become a significant source of the greenhouse gas.