U.S., Canadian forests fall to beetle outbreak

A sea of green turns orange

From the vantage point of an 80-foot (25 meter) tower rising above the trees, the Wyoming vista seems idyllic: snow-capped peaks in the distance give way to shimmering green spruce.

But this is a forest under siege. Among the green foliage of the healthy spruce are the orange-red needles of the sick and the dead, victims of a beetle infestation closely related to one that has already laid waste to millions of acres (hectares) of pine forest in North America.

The plague has cost billions of dollars in lost timber and land values and may thwart efforts to combat climate change, as forests are major storing houses of carbon, the main greenhouse gas blamed for global warming.

The beetle outbreak, which has taken a lesser, but mounting, toll on spruce trees, could make it that much tougher to meet the ambitious target to reduce U.S. carbon emissions by 17 percent of 2005 levels by 2020 and 83 percent by 2050.

Many researchers have also linked the infestation in the U.S. and Canadian West to climate change, notably a dearth of winters cold enough to kill the voracious little bugs.

Another factor scientists attribute to the outbreak is past forest clearance and fires that saw large areas cleared.

Often when this happens, the forest that regrows in its place will have huge patches of trees the same age and this makes them susceptible to a collective attack when they mature at the same time into the older trees that the bugs favor.

The beetles may collectively wreak havoc by nesting and feeding in the trees but they look harmless enough as individuals, not least because they are so tiny.

SOURCE : REUTERS