When it was established in 1916, the National Parks Service was meant to provide natural attractions to visitors. But in the 1960s, A. Starker Leopold wrote a report that would change the future of the parks, transforming it from a tourist hub to a leading agency for ecosystem science. Today, park rangers are the first responders to the effects of climate change, tasked with preserving a wilderness that is “no longer behaving like it’s supposed to.”

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