In an unexpected discovery, scientists find climate change is yet to alter the ice cover on Yellowstone Lake. However, a tipping point may be coming for North America's largest high-altitude lake, researchers suggest in a new study.
Located roughly 7,733 feet (2,357 meters) above sea level in the heart of Yellowstone National Park and spanning 132 square miles (342 square kilometers), the lake usually freezes over in late December or early January and thaws toward the end of May.
