As Cell Service Expands, National Parks Become Digital Battlegrounds
"When John Muir helped establish the National Park Service, he argued that such parks were vital to help people unplug from the world. 'Break clear away, once in a while, and climb a mountain or spend a week in the woods,' Muir was quoted as saying in 1915. But these days at Yosemite National Park, hikers to Half Dome are likely to encounter people talking on cell phones as they climb to the top."