“The key message from this report is that countries will be able to produce and transport a large enough supply of green hydrogen to affordably decarbonise the hard-to-abate sectors [ see panel, below] and make the energy transition possible. But proper policies must be in place, and some policies need more urgent adoption,” the 64-page study says. The report explains that the green hydrogen sector faces technological, economic, regulatory and environment barriers — “challenges that can be met through a wide range of supportive policies... policy makers [therefore] have a central role to play”. “Policy makers can set targets for the growth of electrolyser capacity and green hydrogen production and consumption. They also can provide support for each stage of deployment — supporting electrolysers and electrolyser manufacturing capacity, ensuring a sufficient supply of renewable electricity, boosting demand for green hydrogen and its derivatives, and creating an infrastructure to store and transport hydrogen.”