Hydrogen is versatile, plentiful, and an increasingly key piece of the net-zero equation. From energy storage to stabilise renewable energy supplies through home heating to powering the future transport systems, hydrogen is a perfect non-polluting fuel since it burns to give only water- no CO2. However, no two ‘colours’ of hydrogen are alike, with green, blue, grey, and black hydrogen arising from different sources and producing other effects on the environment. The RSE’s panel of experts will take your questions on hydrogen in all its forms and aim to provide a more realistic view of hydrogen and how we might produce and use it.