Researchers at the Paul Scherrer Institute PSI have conducted a study to identify regions worldwide that could produce hydrogen most cost-effectively, aiming to support the transition to a hydrogen-based economy and reduce reliance on fossil fuels. Published in Nature Communications, the research highlights the importance of green hydrogen production in achieving climate neutrality, emphasizing the role of sectors like aviation, agriculture, and steel in mitigating their climate impacts through hydrogen use. The study, led by Tom Terlouw and Christian Bauer, explores scenarios for hydrogen demand by 2050, ranging from 111 to 614 megatonnes per year, based on different climate protection measures. Geographical factors such as land availability, renewable energy sources, and water access were considered to determine optimal regions for hydrogen production. Canada emerged as a top candidate due to its open spaces, wind potential, and stable political environment. However, challenges remain, including residual greenhouse gas emissions and the need for global cooperation for efficient hydrogen production and distribution. Despite the hurdles, the study underscores the potential of green hydrogen as a sustainable alternative to fossil fuels, contributing to global efforts towards a greener future.