See Before-and-After Photos of the Changing Environment: National Geographic

Yosemite National Park’s Lyell Glacier has receded tremendously over the last century, exposing swaths of bedrock underneath. Because of their sensitivity to the environment, glaciers are vital barometers of climate change.

For detailed report please visit https://news.nationalgeographic.com/2015/12/151229-before-after-earth-features/