In a functional classroom in a functional building on the UC Davis campus, Arthur Shapiro sits unassumingly in the corner. Rumpled, wearing well-worn Converse All Star tennis shoes, old jeans and a faded, zippered green hoodie, Shapiro could be just another student, except for his weathered face and bushy gray beard.

In fact, Shapiro happens to be one of the world’s leading butterfly experts, a “biodiversity guru,” as one of the students in the class puts it, or “a walking encyclopedia,” says another—and, as it happens, the mastermind behind one of the United States’ leading indicators of a changing climate as well as a changing landscape.

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