The article discusses the challenges and opportunities in kickstarting 'green hydrogen' production to decarbonize the global economy. It highlights the current predominance of 'grey hydrogen' production from natural gas, which emits carbon dioxide, contributing to climate change. In contrast, 'green hydrogen' produced by electrolysis of water using renewable energy sources can be carbon-free. The report by Cambridge Econometrics and the University of Exeter explores the potential of targeted government policies to make green hydrogen cost-competitive globally. By simulating the effects of a global mandate on green hydrogen use in fertilisers and implementing a carbon price on hydrogen production, researchers found that green hydrogen can rival grey hydrogen in terms of cost efficiency. The study emphasizes the necessity of strong and sustained policy support to achieve the 'tipping point' of cost-competitive green hydrogen. Despite challenges, green hydrogen is crucial for decarbonising sectors like fertiliser production and steel manufacturing and may have applications in aviation. The report also highlights regional disparities, with regions like Brazil showing potential for cost-competitive green hydrogen production due to abundant renewable energy sources. However, demand-side policies such as mandates are essential to ensure a balanced demand-supply scenario. The research is part of the EEIST project funded by the UK Government and aims to drive energy innovation and system transition towards a net-zero future.