John Muir, who’s known as the father of National Parks, was a key player in the efforts to preserve what is now Yosemite. He first gained fame for proving that massive glaciers carved the park’s iconic valley and the area around it. Muir did that by finding and documenting those glaciers in the late 1800s; since then, those glaciers have taught us a lot about the Earth. But now, one of those glaciers is dead.
KCRW
