More than two decades ago, Yosemite climber, guide, and conservation advocate, Ken Yager had reached a tipping point. Every season he watched Yosemite Valley become a little dirtier. He began to feel an itch he couldn’t scratch. Ken needed to do something. Yosemite National Park welcomes around 4.3 million visitors each year, while climbers account for tens of thousands of climber days annually. That is a remarkable amount of human movement thro…
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