UNDO is a world-leading carbon dioxide removal project developer specialising in enhanced rock weathering. Enhanced weathering is a nature-based technology that permanently locks away CO₂ from the atmosphere. The geological process of weathering has happened naturally for millions of years, removing billions of tonnes of CO₂ over Earth's history. UNDO accelerates this natural process by spreading crushed silicate rock with a high reactive surface area onto agricultural land, where plants and microbes in the soil speed up the weathering process. The breakdown of the rock by CO₂ dissolved in rainwater releases nutrients and bicarbonates, which end up in the oceans as solid carbonate minerals, permanently removing CO₂. Part of Microsoft and Stripe’s Carbon Portfolios, UNDO is scaling operations in the UK, Australia and Canada. The rock, a by-product of the aggregate and mining industry, is given to local farmers for free and spread on agricultural land using existing infrastructure. In addition to permanent, rapid and scalable carbon removals, UNDO’s holistic partnership model delivers significant co-benefits such as improved soil health, ocean deacidification and increased profits for farming communities.