Global Underground Carbon Storage Reaches Record 43.6 Million Metric Tons

On October 25, 2026, an international consortium led by Imperial College London published the most comprehensive audit of geological carbon sequestration to date. The data reveals that operators permanently stored 43.6 million metric tons of carbon dioxide underground during 2024.[3][4]

That figure represents a new annual record for the industry, confirming a steady upward trajectory in deployment. It pushes the cumulative total of greenhouse gas removed from the atmosphere and locked into rock formations to 421.7 million metric tons over the past three decades.[1][4]

The findings arrive via the 2026 Annual Report of the London Register of Subsurface CO2 Storage. The initiative aggregates self-consistent data directly from operators and government databases to track the physical reality of carbon capture, utilization, and storage worldwide.[2][3]

"The central message from our report is that CCS works, demonstrating a proven capability and accelerating momentum for geologic storage of CO2," said Professor Samuel Krevor, Director of the Register at Imperial College London.[1]

"We have found that industrial-scale carbon management is already a reality and can safely sequester CO2 deep underground," Krevor noted in the consortium's release.[1]

The mechanics of deep storage

Subsurface storage relies on the exact geological mechanics that trap natural gas and oil for millions of years. Industrial facilities capture carbon dioxide from exhaust flues before it reaches the atmosphere, purifying and compressing the gas until it behaves as a supercritical fluid.[3]

Operators then inject this dense fluid thousands of feet underground, typically targeting depleted hydrocarbon reservoirs or deep saline aquifers. These target formations consist of highly porous rock, which acts like a rigid, microscopic sponge to hold the carbon dioxide in place.[3]

A thick layer of impermeable caprock sits directly above the storage reservoir, preventing the buoyant fluid from migrating back toward the surface. Over time, the injected carbon dioxide dissolves into the surrounding saline water, increasing its density and causing it to sink further.[3]

Eventually, the dissolved carbon dioxide reacts with the host rock to form solid carbonate minerals. This mineralization process permanently locks the carbon into the geological record, eliminating the risk of future atmospheric leakage.[3]

The new dataset shows this mechanism is now operating across 70 distinct commercial projects in 17 countries. The United States currently leads global deployment by a wide margin, with 23 active projects reporting a combined 20.2 million metric tons of storage in 2024.[4]

The industry's growth curve is steepening noticeably. The 43.6 million metric tons sequestered in 2024 represents a rough doubling of the 21.0 million metric tons recorded in 2016, the last time the sector saw a major inflection point in deployment.[4]

Scaling toward climate targets

Despite the record-setting volume, current storage rates remain a fraction of what global climate models demand. International climate agreements rely on carbon capture reaching gigaton scales—billions of tons annually—to offset emissions from hard-to-abate sectors like cement and steel manufacturing.[2]

The consortium behind the Register, which includes researchers from Stanford University, the Massachusetts Institute of Technology, and Australia's CSIRO, emphasizes that the technology itself is no longer the primary bottleneck. The physical mechanics of injection and containment are thoroughly proven.[1][4]

Instead, the friction limiting broader deployment lies in project finance and infrastructure coordination. New capture facilities are increasingly relying on shared transport networks that have yet to be fully built out, requiring massive upfront capital.[2]

Industry analysts note that while commercial projects are operating globally, the capital-intensive nature of the infrastructure requires predictable revenue streams. Stable policy and clear allocation of long-term liability are essential to attract private investment.[2][3]

Environmental advocates maintain a cautious stance on the technology's rapid expansion. While acknowledging the necessity of capturing industrial emissions, critics argue that enhanced oil recovery—where injected carbon dioxide is used to extract more fossil fuels—still accounts for a significant portion of historical storage volumes.[1]

The London Register aims to cut through that debate by providing transparent, independently verified data on exactly where and how the carbon is being stored. The 2026 report establishes a rigorous baseline for accountability as the industry attempts to scale its operations.[3]

The next phase of deployment hinges on a massive pipeline of projects currently under construction across North America and Europe. Whether those facilities come online on schedule will determine if the industry can maintain its current growth trajectory.[2]