Despite efforts to reduce CO2 emissions, the aviation industry continues to be a significant contributor to greenhouse gases. Researchers are now focusing on hydrogen as a clean fuel source for aviation, aiming to revolutionize air travel. By modeling the use of hydrogen in regional and short-range aircraft, scientists have found that the transition could lead to a substantial reduction in CO2 emissions, potentially up to 90%. The key challenge lies in developing the infrastructure for hydrogen generation and distribution. Methods like natural gas reforming with carbon capture and electrolysis are being explored, but each comes with its own set of challenges. The researchers suggest that starting the rollout of hydrogen-based aviation in locations with favorable hydrogen production conditions could pave the way for a broader adoption. The study emphasizes the need for weight reduction in aircraft to accommodate hydrogen fuel tanks and fuel cells, which may impact payload capacity and flight frequency. However, improvements in fuel cell power and fuel system efficiency could negate the need for payload reductions. The potential benefits of hydrogen-powered flight extend beyond the aviation sector, as transitioning to hydrogen fuel could have a positive domino effect on decarbonization efforts in other industries like road transportation and shipping. Overall, the sentiment towards hydrogen in aviation is positive, with researchers optimistic about its role in creating a greener and more sustainable future for air travel.