Many are talking about hydrogen as the magic word of the energy transition. But here we need to take a closer look: How is it being produced, what are the social and ecological consequences of the different modes of production? In which sectors is it needed and what should it (not) be applied for? How can international trade in green hydrogen be made fair and sustainable? Hydrogen comes in numerous colours. An explainer video by the Heinrich-Böll-Stiftung shows why only green hydrogen can be sustainable, how and, above all, what we should use it for. The video is also available in Arabic, French, German, Portuguese and Spanish. Read more about green hydrogen.