Educators and students from the University of Maine, the Mongolian University of Science and Technology and Gary Comer College Prep travel to Mongolia, where they hike mountains and glaciers in search of boulders. About 20,000 years ago, glaciers sprawled across Western Mongolia, but the warming climate has caused glaciers to shrink, leaving behind boulder debris. By sampling the surface of these boulders, geologists can determine how many years ago the glaciers deposited these boulders onto the landscape. They then calculate the distance of the current glacier's edge from the location of the boulder. By putting both pieces of the equation together they can identify how fast glaciers are receding, which allows them to calculate the rate of the warming climate. Stephanie Fox reports.