The debate on whether sustainably produced hydrogen needs to be completely green is ongoing, with researchers suggesting that 'nearly sustainable' hydrogen could be more beneficial, especially in ammonia production. Currently, ammonia production, crucial for the fertiliser industry, heavily relies on hydrogen extracted from natural gas, resulting in high greenhouse gas emissions and dependence on gas-exporting countries. By using green hydrogen, produced through electrolysis using sustainable electricity, greenhouse gas emissions in ammonia production could be reduced by up to 95%. The study revealed that in countries like Norway and Spain, green hydrogen for ammonia production is already economically viable due to favorable conditions and cost-effective renewable energy sources. Despite the need for further research and development to make green hydrogen competitive across Europe, the study highlights that a slight level of fossil energy in green hydrogen production can still have a positive climate impact. This flexibility is essential to ensure a smoother transition towards sustainable energy practices. The research team also emphasized the importance of balancing costs and environmental impact in defining 'green' hydrogen, recommending a residual proportion of up to one kilogramme of CO2 emissions per kilogramme of hydrogen as acceptable and sensible.