AI can be used for unsavory things, like any technology. But researchers at the nonprofit Global Fishing Watch have revealed a promising use case — enlisting AI to accurately track human activity on the oceans, according to its new study published in the journal Nature. There’s a lot out there that has long floated under the radar of monitoring systems, including the so-called dark fleets involved in illegal and unregulated fishing. Marketplace’s Lily Jamali spoke with David Kroodsma, director of research and innovation at Global Fishing Watch, about the group’s work.