Some people collect pinyon pine nuts this time of year for a tasty autumn treat. Others sell them for extra income. But Catherine Gehring of Northern Arizona University goes nut-gathering every September for a different reason. She researches ways pinyon pines survive drought—at a time when a hotter, drier climate is predicted to drive the trees out of Arizona entirely. KNAU’s Melissa Sevigny spoke with her in the woodlands east of Flagstaff.