- Enhanced Rock Weathering (ERW) is gaining attention as a scalable carbon removal solution. A recent study suggests the method could remove up to 350 million tonnes of CO₂ per year by 2050 if widely deployed.
What is Enhanced Rock Weathering?
Enhanced Rock Weathering is a carbon removal method that speeds up a natural geological process. Rocks such as basalt and silicates naturally react with carbon dioxide (CO₂) over thousands of years.
ERW involves crushing these rocks into fine powder and spreading them on the soil. The larger surface area makes the rocks react faster with CO₂ in the air and soil. Scientists believe this could permanently capture and store carbon as stable minerals or ocean carbon pools.
This carbon removal has emerged as a promising part of the climate toolkit to help lower atmospheric CO₂ levels.
How ERW Removes Carbon
Natural rock weathering already captures about 1.1 billion tonnes of CO₂ per year from the atmosphere. ERW accelerates this process by increasing the rock’s contact with CO₂.
When rainwater dissolves CO₂, it forms carbonic acid, which reacts with silicate rocks. This reaction locks carbon into bicarbonate ions. Some of the ions wash into rivers and reach the ocean, where they can stay for thousands of years. Because the carbon is stored this way, it is unlikely to return to the atmosphere soon.
In agriculture, ground rocks applied to the soil enhance this process. The rocks react with CO₂ around plant roots and soil microbes. Some companies source rock dust from quarries. They use industrial byproducts instead of new mining.
350 Million Tonnes: The Mid-Century Potential
New research shows that ERW could make a major contribution to climate goals by mid-century. Scaling ERW on suitable agricultural land and other surfaces worldwide could remove an estimated 350 million tonnes of CO₂ per year by 2050. This would come from fast-tracking the natural weathering process across large areas of cropland.
Global modelling studies also suggest even bigger potential. ERW could cut hundreds of millions to billions of tonnes of CO₂ each year by 2050. This depends on widespread use, strong policy support, and proper infrastructure.
Some studies focused on the United States have reported similar potential. Research shows that ERW in U.S. agriculture could cut CO₂ by 160 to 300 million tonnes each year by 2050. If expanded, this number could reach 250 to 490 million tonnes by 2070.
This 350 million-tonne figure sits within a broader picture of potential CDR capacity. Some analyses suggest that ERW could remove billions of tonnes every year. This would occur if the method is used widely across continents with big agricultural sectors.
Why ERW Stands Out in the Carbon Removal Race
One key reason ERW attracts attention is its durability. Carbon captured through rock weathering is stored in stable forms that can last thousands to millions of years. This permanence can make ERW more durable than some nature-based solutions that store carbon only for the lifetime of trees or plants.
ERW also builds on existing farming and mining systems. The technology uses known equipment and methods for crushing and spreading rock. This means ERW is likely easier to use widely than complex methods like direct air capture (DAC). DAC needs big new facilities and a lot of energy.
Enhanced rock weathering has additional benefits beyond carbon capture. When applied to agricultural soils, silicate rock dust can improve soil nutrition and structure. This can enhance crop yields and reduce the need for some fertilizers. Some research has even shown that certain enhanced weathering practices can improve crop performance while removing CO₂.
ERW Carbon Removal Credits Snapshot
ERW has begun to enter this market with real, verified credits. In early 2025, InPlanet and Isometric issued the first independently verified ERW carbon removal credits. These credits show long-lasting CO₂ removal. They are certified with strict monitoring, reporting, and verification (MRV) protocols.
While ERW still makes up a very small share of total credits traded in 2025, its emergence marks a milestone for carbon removal markets. Early tracking shows that nearly one million ERW credits have been sold, and the total investment in ERW projects is about US$121 million. This reflects increasing interest from companies and offset buyers.
ERW carbon credit prices now range from $200–$500 per tonne. This spread comes from differences in project size, location, and how mature each method is.
Early ERW credits add variety to the carbon market. They focus on carbon removal, which is attracting buyers like Google and Microsoft. They want long-term, verified removal credits along with avoidance credits.
- SEE MORE: Microsoft Backs InPlanet’s Enhanced Rock Weathering Push to Remove 28,500 Tons of CO₂ in Brazil
Scaling Up: Verification, Logistics, and Adoption Hurdles
Despite its promise, ERW faces several challenges before it can deliver on its full potential by 2050.
- Monitoring and verification: Measuring exactly how much CO₂ ERW removes is complex. The process occurs over time and involves soil chemistry, water movement, and geological cycles. Accurate monitoring, reporting, and verification (MRV) systems are needed to ensure that carbon removal amounts are real and not overstated.
- Deployment logistics: Scaling ERW globally would require vast amounts of crushed rock. This means expanded quarrying, crushing, transport, and spreading infrastructure. These steps must be done efficiently to avoid high emissions from transport and machinery.
- Agronomic adoption: Farmers and landowners would need incentives and support to adopt ERW. Also, the use of rock dust must align with soil types, crops, and local farming practices. Long-term studies are ongoing to determine the best application rates and conditions for different regions.
- Environmental questions: While ERW can benefit soil fertility, some uncertainties remain about long-term ecosystem impacts and potential side effects. Careful planning and studies are needed before very large-scale deployments can occur.
A Key Piece in the Net-Zero Puzzle
Climate models show that reducing emissions alone won’t be enough to meet the Paris Agreement’s goals. Many experts argue that carbon dioxide removal (CDR) must play a role in keeping the temperature rise below 1.5°C. ERW is one of several CDR methods being considered.
Other CDR approaches include direct air capture (DAC) and bioenergy with carbon capture and storage (BECCS). DAC uses machines to pull CO₂ directly from the air, but it is still expensive and energy-intensive.
BECCS captures CO₂ from biomass energy but depends on large dedicated biomass supplies. ERW, by contrast, can leverage natural soil processes and agricultural lands for scalable removal.
Policy makers and climate planners see enhanced rock weathering as one piece of a broader carbon removal portfolio. ERW, along with strong emissions cuts, nature-based solutions like reforestation, and new technologies, can help balance hard-to-abate emissions in sectors such as industry and agriculture.
To reach 350 million tonnes of CO₂ removal per year by 2050, ERW must scale rapidly. This will require stronger global commitment from governments, research institutions, and private investors.
Moreover, investment in field trials and pilot programs will help refine practices and decrease uncertainty. As more data becomes available, ERW techniques can be optimized for different soils, climates, and crop systems.
Public policy support will also be key. Carbon markets, incentives, and crediting systems that recognize verified removal could help fund large-scale ERW deployment. If aligned with broader climate goals, ERW could become a major contributor to meeting global net-zero targets.
The post Rocking the Carbon Clock: ERW Could Cut 350 Million Tonnes of CO₂ Annually by 2050 appeared first on Carbon Credits.
The accounting differences that decide whether your nature investment shows up in inventory, in BVCM, or nowhere at all.
The question reaches a procurement team about three weeks before the next sustainability committee meeting. Someone has read about insetting. Someone else has just signed off on an offset purchase. The CSO wants to know if the two are interchangeable. The answer is no, and the GHG Protocol Land Sector and Removals Standard is the reason why.
This article walks through what each term means at audit-grade specificity, what the standards actually say about how each gets counted, and how to decide which tool fits which target. The insetting vs offsetting question is one of the most-searched in corporate climate strategy, and one of the most poorly answered. By the end of this piece, you should be able to brief a committee on the difference without notes.
The two definitions, in plain English
Offsetting means buying carbon credits generated outside your value chain and retiring them against your residual emissions. The reduction happens somewhere else, financed by you, and the credit is the receipt.
Insetting means investing in emission reductions or removals inside your own value chain, typically with suppliers, where the reduction is directly linked to the products and services you buy. The reduction happens inside the boundary of your Scope 3 inventory, and the accounting treatment is fundamentally different.
The shorthand from the University of Oxford’s Nature-based Insetting Initiative is useful: insetting is what you do with the supply chain you have; offsetting is what you do with the supply chain you do not have.
What the GHG Protocol Land Sector Standard actually says
The GHG Protocol Land Sector and Removals Standard, finalised in 2024 after a multi-year pilot, sets the rules for how land-based emission reductions and removals enter corporate inventories. The Standard distinguishes between inventory accounting (Scope 1, 2, and 3) and project or intervention accounting (a separate methodology for crediting).
For insetting, the practical implication is that supplier-level interventions, when properly measured and attributed, can reduce your Scope 3 category 1 (purchased goods and services) emissions in your inventory. The reduction is not a credit retired against the inventory; it is a lower inventory number, period.
For offsetting, the credit is retired separately. It can be reported as a contribution toward a net-zero claim under the SBTi Beyond Value Chain Mitigation framework or as part of a VCMI Carbon Integrity claim, but it does not lower the inventory number.
A practical consequence: if your Science Based Target requires a 50% absolute reduction in Scope 3 emissions by 2030, insetting moves you toward the target. Offsetting does not. This single point of difference reshapes the procurement decision.
When insetting counts toward Scope 3 (and when it does not)
Insetting counts toward Scope 3 only when several conditions are met:
- The intervention must occur with an entity in your value chain.
- The emissions reduction or removal must be measured against a defensible baseline.
- The reduction must be attributed to your share of that supplier’s output, not double-counted with other buyers.
- It must follow the inventory accounting rules in the GHG Protocol Land Sector Standard, not the project accounting rules used to generate credits.
The most common failure mode is double counting. If your supplier sells the same reduction as a credit on the voluntary market and also reports it to you as a Scope 3 reduction, the math breaks. The Standard requires you to address this risk, typically by purchasing and retiring the supplier-issued credit as part of your inventory or by contractual provisions that prevent the supplier from selling the reduction twice.
When insetting does not count toward Scope 3: when the intervention sits with a supplier you do not buy from, when the baseline is not defensible, when the attribution is unclear, or when the documentation does not survive audit. Those cases default to Beyond Value Chain Mitigation, which is still useful but operates on a different ledger.
The procurement and supplier engagement question
Insetting is harder than offsetting. That is the unfashionable truth most buyers eventually confront. Offsetting is a transaction; insetting is a relationship.
To run an insetting program, you need supplier mapping precise enough to know which farms or facilities sit at which Scope 3 boundary. You need an engagement model that gets suppliers to participate, which usually requires multi-year commitments and shared economics. You need an MRV architecture that measures the right things and produces audit-ready documentation. And you need a contractual structure that prevents double counting and protects both sides.
The trade-off you receive in return is significant. Reductions count against your inventory rather than your residual. Supplier relationships deepen, which protects sourcing continuity. Yield and quality improvements often follow regenerative interventions, which reduces your input cost over time. And the regulatory file, under CSRD, CSDDD, EUDR, and the SBTi FLAG Guidance, is materially stronger.
Choosing the right tool for the right target
A practical decision rule. If your target is a science-based Scope 3 reduction and you operate in a FLAG sector or source FLAG commodities, insetting is the structurally correct tool. If your target is a net-zero claim that includes neutralising hard-to-abate residual emissions outside your value chain, BVCM via high-integrity offsets is the structurally correct tool. Most companies with material Scope 3 exposure need both, in different proportions, sequenced over time.
The sequencing matters. Insetting takes longer to stand up but produces a permanent reduction in the inventory. Offsetting can be transacted faster but does not change the inventory and now sits under tighter claim restrictions. Treat them as complementary tools with different jobs, not as substitutes. The Accountability Framework Initiative and the IUCN Global Standard for Nature-based Solutions both provide useful guardrails for the insetting side, with biodiversity, human rights, and benefit-sharing requirements that go beyond carbon math.
If you are mapping a Scope 3 reduction roadmap and need to scope which interventions count toward your inventory versus which sit in Beyond Value Chain Mitigation, the carbon and sustainability experts at Carbon Credit Capital can help you structure a nature-based supply chain investment program that fits your FLAG exposure, your target architecture, and your audit horizon. Schedule a consultation.
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