![]() Graphyte says its approach will keep that carbon securely stored for 1,000 years or longer. Then the blocks are sealed with a special polymer, stacked, and buried, with sensors to monitor the carbon blocks to make sure that the sealant is holding up (if the sealant is broken, the block of biomass would likely start to decompose, releasing CO2 back into the atmosphere). Graphyte’s approach, which it refers to as carbon casting, works by gathering crop waste or other carbon-rich biomass, drying it, and compressing it into large blocks. Read more: Silicon Valley Is Betting on Carbon Capture. (The company has not yet sold the carbon removal service to potential buyers, but it says it will be announcing offtake agreements soon.) It has not completed a pilot plant yet-that facility will come next year-but it says there’s nothing holding it back from rapidly scaling up. ![]() In an announcement this morning, Graphyte claims that its new carbon sequestration technique beats the $100 per ton bar-though it declined to specify exactly what its internal cost per ton is. Many of the largest carbon removal startups project that level of affordability is years or even decades away.Ī Bill Gates-backed startup called Graphyte, however, says it’s hit that cost benchmark. Academics and industry experts generally agree that getting costs down below $100 per ton of sequestered CO2 would be the point at which, economically, such massive carbon capture schemes become feasible. Most of the current technologies are currently extremely expensive-often costing around $600 for every ton of sequestered CO2. One of the main factors holding back these methods of capturing and removing carbon emissions is cost.
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