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<p>University of Wyoming geology and geophysics professor Ken Sims drops a small tube into a geologic formation while collecting water samples for his research near Mammoth Hot Springs last November. Sims and a small team spent time in the park looking to collect radium samples and test PH levels, among other things. Sims, who has been featured in National Geographic Magazine, is one of the world's leading volcano researchers. He took his position at UW in part to be able to research Yellowstone.</p>

<p>University of Wyoming geology and geophysics professor Ken Sims drops a small tube into a geologic formation while collecting water samples for his research near Mammoth Hot Springs last November. Sims and a small team spent time in the park looking to collect radium samples and test PH levels, among other things. Sims, who has been featured in National Geographic Magazine, is one of the world's leading volcano researchers. He took his position at UW in part to be a…

January 2, 2015

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National Geographic to produce issue on Yellowstone threats
January 2, 2015 8 p.m.

National Geographic to produce issue on Yellowstone threats

Bison herd, geothermal system changes among topics

BILLINGS, Mont. (AP) - A new report on threats to Yellowstone National Park reveals that National Geographic Magazine will release an issue in 2016 dedicated to the Greater Yellowstone Ecosystem.