"Currently, less than 0.1% of hydrogen produced in Europe is green, produced via the electrolysis of water, with the electricity used in the process coming from renewable sources like wind and solar. More than 90% is grey hydrogen, made using fossil fuels like oil and coal, which emit CO2. This means that at a moment of climate emergency, public investment in hydrogen will essentially keep funding the same old pollutants."
https://www.opendemocracy.net/en/oureconomy/on-climate-change-dont-believe-europes-hydrogen-hype/