The MIT Startup Exchange, established over eight years ago, supports MIT-connected startups in addressing global challenges. At the 2024 MIT Sustainability Conference, eight sustainability-focused startups were featured for their innovative solutions. 3D Architech tackles inefficient fluid flow in data center cooling systems with a lithography-based metal 3D printing process, improving cooling performance and green hydrogen production. Allonnia addresses the environmental impact of rare earth element mining by using proteins to recover REEs from mine-impacted water. Electrified Thermal Solutions presents the Joule Hive Thermal Battery as an affordable option for zero-carbon electric heating, claiming cost advantages over hydrogen production. Emvolon converts methane emissions into liquid green fuels using a portable chemical plant, offering a cost-effective solution for decarbonizing sectors like shipping. Femto Energy develops air-cooled nuclear batteries for scalable, zero-carbon energy production, suitable for industrial and remote locations. Helix Carbon introduces an electrochemical system to convert carbon dioxide from flue gas into valuable industrial gases, reducing production costs and emissions. Noya offers a gigaton-scale direct air carbon capture system for scalable and sustainable removal of carbon dioxide from the atmosphere. Sesame Sustainability focuses on facilitating sustainability projects through collaboration among different stakeholders. These startups exemplify the innovation and commitment to sustainability showcased at the conference.