In the fourth and final episode of his climate series, Ezra Klein hosts Dr. Jane Flegal, a geoengineering expert at Arizona State University and program officer for environment at the Bernard and Anne Spitzer Charitable Trust, to discuss the complicated topic of geoengineering. In this conversation, Ezra and Dr. Flegal cover geoengineering technologies, their feasibility as a solution to climate change, the political challenges surrounding geoengineering technologies, and the ethical complexities of intentionally engineering the earth’s climate. Dr. Flegal is able to eloquently and lucidly discuss these topics and offers a critical, but fair, assessment of the current and future states of geoengineering technologies.