In this episode of Earthlings 2.0, we speak with Mark Verhagen, CEO and co-founder of Renewable Iron Fuel Technologies (RIFT), a company turning rust into a clean heat source for heavy industry. You see, industrial heat, from cement kilns to steel plants, accounts for roughly 20% of global emissions, yet most facilities can’t electrify or switch to hydrogen because of grid and infrastructure limits. RIFT’s answer? Burn iron powder instead of fossil fuels, then recycle the “ash” (iron oxide) back into reusable fuel. We unpack how this closed-loop system works, the company’s 1 MW demo plant in the Netherlands, lessons learned as they scale, and why a grid-independent fuel could be the missing piece for decarbonizing the world’s hardest-to-abate sectors.