Yosemite was forged by time and shaped by water, but with climate change, it's feeling the heat. Water is scarcer and the threat of wildfire is more common. See how critters survive as we investigate this great wilderness. Join scientists, experts, and adventurers as they trudge through mountains of snow, climb trees as tall as buildings, and soar high in the air to spy just how these global changes are affecting one of America's greatest wildernesses.