Leaving Only Footsteps? Think Again

New York Times‎ – Sunday Review By CHRISTOPHER SOLOMON FEB. 13, 2015 ONE of the most popular places for backcountry skiing in North America is Teton Pass in Wyoming, high above the adventure playground of Jackson Hole. This winter, as skiers and snowboarders unload gear for a day of sweat and powder-skiing, the researcher Kimberly Heinemeyer has been moving…