Lynn Russell, a professor of atmospheric chemistry at Scripps Institution of Oceanography, conducts research on aerosol particle chemistry to increase our understanding of the role atmospheric aerosols play in Earth’s climate. Russell’s colleague Ellie Farahani, executive director of the Climate Science and Policy Master of Advanced Studies program at Scripps, manages international science-policy initiatives and previously conducted field campaigns measuring greenhouse gas concentrations for more than a decade. Russell and Farahani will present the documentary film, Merchants of Doubt, based on the book written by former UC San Diego science historian Naomi Oreskes, who now teaches at Harvard. Russell uses the film in her teaching, which demonstrates how climate change deniers and special interests have attempted to influence the science-policy landscape. Climate Change at the Crossroads is an event series hosted by the UC San Diego Library as a salute to the renowned climate scientists at UC San Diego’s Scripps Institution of Oceanography illuminating different aspects of climate change challenges—the case for a more unified approach that includes religious leaders and social scientists, the tools of deception, and the communications challenges faced by scientists.