Stock Photo - Rocky Mountain National Park, Colorado - The park service has cut down most of the trees in the Timber Creek campground because they have been killed by an outbreak of mountain pine beetles The beetle has killed millions of acres of pine trees in the American west Scientists expect the problem to worsen due to global warming, because very cold weather is needed to kill the beetles

Stock Photo: Rocky Mountain National Park, Colorado - The park service has cut down most of the trees in the Timber Creek campground because they have been killed by an.

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