Kenya-based Mati Carbon claimed the $50 million grand prize with an enhanced rock weathering approach that spreads finely ground volcanic rock on farmland, simultaneously capturing atmospheric carbon while improving soil health for local farmers. Mati Carbon's victory wasn't just about technical innovation; it demonstrated a cost-effective approach that delivers multiple benefits in Kenya and India's smallholder farming communities. Three runners-up—NetZero, Vaulted Deep, and UNDO—each received $5 million for their distinct approaches, which spanned biochar production, underground carbon storage, and large-scale mineral spreading.
In 2024 alone, humans released 41.6 billion tons of CO2 into the atmosphere, adding to approximately 1.5 trillion tons emitted since the Industrial Revolution. Current carbon removal projects operate at a kiloton scale and must rapidly expand to millions of tons annually. The goal isn't merely offsetting new emissions—it's achieving net-negative emissions to reverse the climate damage already done, albeit slowly. Learn more about the XPRIZE Carbon Removal competition and other grand challenges at xprize.org. Watch the documentary series about the competition and winners on the XPRIZE Carbon Removal YouTube channel.
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