Levi Lewis, one of Peter Moyle’s many former undergraduate students, now runs the Otolith Geochemistry and Fish Ecology Laboratory at UC Davis. His previous research has taken him to wetlands, seagrass beds and coral reefs around the world. He’s currently studying Delta smelt and longfin smelt — two critically endangered fishes in San Francisco Bay. We talked about climate anxiety, privilege and the value of science, empathy and staying the course.