Hydrogen could play a significant role in tackling climate change. Using it does not produce carbon dioxide, so it could replace fossil fuels in a range of applications. It may also provide valuable energy storage. However, almost all hydrogen production currently results in greenhouse gas emissions. Methods of producing it that do not emit greenhouse gases would need to increase for it to contribute to climate change mitigation. Governments and industry in the UK and abroad are aiming to increase low-carbon hydrogen supply. The UK Government will publish a Hydrogen Strategy in 2021.