Ammonia production, a crucial process for nitrogen fertilizer, has long been associated with high greenhouse gas emissions. MIT engineers have proposed a novel approach to address this issue by using the Earth as a chemical reactor to produce ammonia underground. By injecting water into iron-rich rocks, the team can generate clean hydrogen, which then reacts with nitrogen to form ammonia. This innovative method eliminates the need for fossil-fuel-powered plants, reducing energy demands and emissions. The research aims to create a more sustainable and efficient way of producing ammonia, crucial for global agriculture. By leveraging the Earth's natural heat and pressure, the team's 'geological ammonia' process shows promise in revolutionizing the industry and mitigating environmental impact. With potential benefits for regions with limited access to traditional ammonia plants, this breakthrough could pave the way for a cleaner and more cost-effective future in ammonia production and transportation.