Close Authorship This year saw a slew of global hydrogen announcements that earned it the title of "hottest new tech on the decarbonization block." There is broad consensus that "green" hydrogen produced from renewable energy and water will be needed to avoid even more dangerous climate change by helping us achieve a net-zero emissions global economy by midcentury. But it has limits, despite the fossil fuel industry touting it as the one-size-fits-all solution even for applications that have much cheaper alternatives. There’s no question that 2020 was a banner year for hydrogen. Large chunks of COVID-19 recovery packages across Europe were earmarked for the technology, more than 10 large countries put out national hydrogen roadmaps — mostly focused on green hydrogen — and large-scale projects were announced across Europe,Australia, Asia and the Middle East. While the United States is trailing behind, momentum is growing here with a series of announced green hydrogen projects, new regional hydrogen initiatives and policy documents indicating growing interest at the federal level.