The global average temperature for July 2023 was the highest on record—and maybe the highest for the last 120 years according to the United Nations’ weather agency. In the United States, temperatures in Phoenix, Arizona reached a record 118 degrees Fahrenheit and hit highs of at least 110 degrees for 31 consecutive days—also a record. And yet the populations of Arizona, Texas, and Florida, the states hardest hit by the warming trends, continue to expand. All of those people need air conditioning and refrigeration to make life bearable--but current cooling technologies just make the planet warmer. That's why Jinyoung Seo, PhD '23, wants to reinvent the air conditioner. In this episode of Colloquy, Seo talks about how he uses solid refrigerants to eliminate cooling systems’ direct greenhouse gas emissions—all while making them smaller and vastly more efficient.