Haze in western NPs linked to bark beetle infestations, study says

Is there a connection between climate change, a tiny beetle, and increased haze in the skies over places such as Rocky Mountain and Yellowstone national parks? Research by an assistant professor at Southern Illinois University seems to connect the dots.

To begin drawing the lines, you must accept that warming temperatures in the West are allowing bark beetles -- such as mountain pine bark beetles and spruce bark beetles -- to reach higher elevations than they usually do and reproduce more frequently than during colder periods. As a result, more and more lodgepole pine forests in places such as Yellowstone, Rocky Mountain, Grand Teton, and even Mount Rushmore National Memorial, are being infested, and killed, by these rice-grain-sized bugs.

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