Call it the holy grail: producing steel without emitting greenhouse gases. In Sweden, three companies – SSAB, LKAB and Vattenfall – have been working on it for years under the name HYBRITE. With a pilot plant in operation, the proof of concept has been delivered. Is the production of so-called ‘green steel’ ready for scale-up? And if not, what challenges remain? To answer these questions, I'm joined by Mikael Nordlander, Director of Partnerships at Vattenfall and one of the brains behind HYBRITE.