For years, global climate strategies have rested heavily on the idea that we could bury carbon dioxide deep underground to balance out hard-to-eliminate emissions. This process is known as Carbon Capture and Storage (CCS) and has been presented as a keystone for achieving net-zero emissions. But new research has delivered a discouraging correction – earth has 10x less capacity for underground carbon storage than estimated. According to the study, the global capacity to safely store CO2 is only about one-tenth of what many climate models and industry roadmaps had assumed.

This disclosure could reshape climate negotiations, investment priorities, and the timeline for decarbonization efforts worldwide.

The New Study’s Groundbreaking Findings

The study, led by researchers at the International Institute for Applied Systems Analysis (IIASA) and the Center for Global Sustainability at the University of Maryland, found that the “prudent” capacity for safe underground storage of carbon dioxide is roughly 1,460 billion tonnes (GtCO2).

On the other hand, earlier assessments had pointed to anywhere from 11,000 to 14,000 GtCO2 in potential capacity, often based on broad geological surveys that didn’t fully account for risks. The difference means that earth has 10x less capacity for underground carbon storage than estimated.

Lead author Matthew J. Gidden emphasized that geological storage must be treated as a finite inter-generational resource. His co-author, climate scientist Joeri Rogelj from the Grantham Institute at Imperial College London, noted that many pathways used by the Intergovernmental Panel on Climate Change (IPCC) assume far more storage than is actually available.

The study estimates that if every drop of safe storage were used, it could prevent about 0.7°C of warming – far less than previously hoped, given that the world is already about 1.2°C warmer than pre-industrial levels.

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Why Previous Estimates Were Overstated

So how did earlier numbers overreach reality so dramatically?

For one, earlier projections often assumed that all global sedimentary basins could be utilized for CO2 injection. Institutions like the International Energy Agency (IEA) included regions that were geologically sound on paper but practically unsuitable.

The new Nature analysis applied a series of exclusion filters:

• Areas disposed to earthquakes were ruled out due to leakage risks.
• Basins that were too shallow or too deep were dismissed because of the pressure and monitoring challenges.
• Regions that were near densely populated zones or protected ecosystems were removed for safety and social reasons.
• Offshore formations at supreme depths were considered impractical due to cost and complexity.

By systematically excluding these, the researchers concluded that about 87-88% of the theoretical storage capacity came to an end, leaving the world with only about one-tenth of the figure that policy makers and corporations like ExxonMobil or Shell had counted on. In brief, the belief that vast underground “savings accounts” could offset emissions indefinitely is no longer credible, as the Earth has 10x capacity for underground carbon storage than estimated.

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Global Impact of Having 10x Less Storage

The outcome of this revised capacity ruffled across industries, governments, and climate strategies. Here are some of the biggest impacts, explained in detail:

Countries Face Tougher Net-Zero Timelines

Nations that have planned to lean heavily on underground storage to balance out fossil fuel use will have to cut emissions quickly. If earth has 10x less capacity for underground carbon storage than estimated, then there’s far less wiggle room to delay transitions.

Heavy Industries are Under Real Pressure

Sectors like steel, cement, and aviation, which are already tough to decarbonize, may no longer be able to rely on large-scale CCS. Companies with flagship projects, such as ArcelorMittal in steel or Airbus in aviation, could face strategic failure.

Energy Investment Shifts

With the availability of less storage, governments and investors may channel more funds toward renewable energy projects. That aligns with trends tracked by the International Renewable Energy Agency (IRENA), which reports a record increase in solar and wind deployments.

Developing Nations Face Inequities

There are many low-income countries that lack the geology or technical capacity to develop safe storage. If earth has 10x less capacity for underground carbon storage than estimated, these nations may be forced into costlier mitigation strategies without the financial support which richer countries enjoy.

Global Climate Frameworks Need Emendation

Agreements like the Paris Agreement and scenarios modeled by the IPCC must be revisited. If projections relied on abundant underground storage, they may no longer reflect reality.

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Alternatives That Could Bridge the Gap

If underground storage is so limited, then what’s next? Experts suggest that while it remains important, it must be reserved for the hardest-to-abate sectors, while other strategies scale up.

• Afforestation and reforestation can absorb carbon in trees and soils. There are countries like India that are already expanding green cover as part of climate pledges.
• Soil carbon sequestration practices, such as no-till farming or biochar use, are gaining traction. There are programs that promote this globally, like the 4 per 1000 Initiative.
• Direct Air Capture (DAC) companies such as Climeworks and Carbon Engineering are testing large-scale facilities to pull out CO2 directly from the air.
• Carbon mineralization projects in regions like Iceland, via CarbFix, inject CO2 into basalt rock, where it converts into stable minerals.
• Above all, rapid decarbonization of the energy sector remains critical. The International Energy Agency highlights that renewable deployment, electrification, and efficiency improvements can prevent more emissions than underground storage could ever mop up.

In a nutshell, the safest strategy is not to assume storage will save us, but to acutely cut emissions now. As the study underscores, the earth has 10x less capacity for underground carbon storage than estimated, so that capacity must be treated as scarce, precious, and valuable.

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Key Things to Know

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Frequently Asked Questions (FAQs)

Q1. Why does the study claim earth has 10x less capacity for underground carbon storage?

This is because earlier numbers included almost every potential sedimentary basin, regardless of safety or feasibility. The new study in Nature applied strict geological, technical, environmental, and social filters, removing unsafe or impractical sites and found that the safe capacity is only about 1,460 GtCO2, roughly around one-tenth of past estimates.

Q2. How will this affect future climate policies and net-zero targets?

It means policymakers and corporations can no longer assume that CCS will cover a big chunk of emissions. Governments will need to build up renewable deployment, enforce stricter emission standards, and reserve underground storage for essential sectors. If earth has 10x less capacity for underground carbon storage than estimated, net-zero pathways must be amended.

Q3. Can renewable energy and alternative methods replace underground storage?

No, not entirely – but somehow they can significantly reduce the burden. Expansion of solar, wind, and hydropower, investing in Direct Air Capture and carbon mineralization, and supporting nature-based solutions can complement the limited storage available. The future will need a portfolio of solutions, not just one silver bullet because earth has 10x less capacity for underground carbon storage than estimated.

Q4. What risks could we build up with relying too heavily on underground carbon storage?

While underground storage can lock away CO2 safely in some cases, there are chances of risks if we over-rely on it. These include potential leaks if geological seals fail, induced seismic activity in some regions, high monitoring and maintenance costs, and social resistance from communities living near storage sites. The new Nature study illustrates that many basins are unsafe or impractical for long-term use, which is why earth has 10x less capacity for underground carbon storage than estimated.

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