Why scientists are tracking how humans move through national parks

CHEYENNE, Wyoming — Scientists are putting tracking devices on a new species — people — as they try to learn more about how their movements affect ecosystems in national parks. Park visitors carrying global positioning devices have provided data to Colorado's Rocky Mountain National Park, so it can improve shuttle service to a popular and often congested lake. Another recent study at California's Yosemite National Park tracked where people stroll through two popular meadows, and pause now ...