IEA (2023), Global hydrogen production CO2 emissions and average emissions intensity in the Net Zero Scenario, 2019-2030, IEA, Paris https://www.iea.org/data-and-statistics/charts/global-hydrogen-production-co2-emissions-and-average-emissions-intensity-in-the-net-zero-scenario-2019-2030-3, Licence: CC BY 4.0