Whatever your talent or ambition, Harrison Ford has a simple charge: Put it to work. The actor and Conservation International vice chair delivered that message Monday as commencement speaker at Arizona State University. The university had good reason to call: It recently launched the Rob Walton School of Conservation Futures in partnership with Conservation International , creating a training ground for the next generation of conservation leaders. To the graduating class, Ford spoke of finding purpose to match your passion. His came relatively late in life, during a chance encounter with Conservation International that changed his worldview and his role as a storyteller. “I hadn't found purpose higher than my job yet,” he said. “That changed in the late ’80s. I was living in Wyoming, and I was impressed by a group of people that I met there who had recently formed a nonprofit called Conservation International.” For Ford, that clarity of purpose came from nature.…