Google has signed its largest carbon removal offtake to date, backing an enhanced rock weathering (ERW) project in southern Brazil that pairs durable carbon removal with super pollutant abatement. The deal, reported on 16 September, lands in the same week that analysts forecast direct air carbon capture and storage (DACCS) costs falling by more than 40 percent by 2030. Together, the two signals describe a carbon removal market that is moving from pilot purchases toward industrial scale and a steeper cost curve.
The Deal: Google’s Biggest CDR Commitment So Far
The offtake was signed with a US-based enhanced rock weathering developer, according to Carbon Pulse, and supports a project in southern Brazil described as combining super pollutant mitigation with ERW. Reuters reports that the agreement is Google’s biggest carbon removal deal yet and that the company aims to scale the model. According to the Reuters report, the project spans more than 200,000 hectares in the southern state of Rio Grande do Sul, making it the largest enhanced rock weathering project to date.
Neither the contracted volume nor the price per tonne has been disclosed in the reporting seen so far. That opacity is itself a data point: even flagship CDR transactions still close without public benchmarks, leaving the market to infer pricing from adjacent evidence rather than from deal terms.
Why ERW, and Why Brazil
Enhanced rock weathering accelerates a natural process: finely crushed silicate rock, typically basalt, is spread on farmland, where it reacts with CO2 dissolved in rainwater and locks carbon into stable mineral and ocean-bound forms. The appeal for a buyer like Google is twofold. First, durability: mineralised carbon has storage permanence measured in millennia, a different risk class from nature-based removals exposed to fire and reversal. Second, co-benefits: rock dust can improve soil health for the host farms, which matters for community licence to operate at scale.
Brazil offers the operating conditions ERW needs: abundant basalt from existing quarrying, year-round warm and wet weather that speeds the weathering reaction, and large commercial farming areas where spreading can piggyback on existing agricultural logistics. A project exceeding 200,000 hectares, as reported, moves ERW from field trials into territory that resembles industrial supply chains rather than experiments.
The super pollutant component adds a second climate lever to the same project. Super pollutants such as methane and certain industrial gases carry far higher warming potency per tonne than CO2, and their abatement has become a priority category for corporate buyers looking to maximise near-term climate impact per dollar.
The Cost Curve Is Moving at the Same Time
The Google deal coincides with a notable forecast on the other end of the engineered-removal spectrum. Analysts whose forecasts were assembled by a CDR marketplace see the cost of DACCS removals falling to around $450 per tonne by 2030, down from an average of roughly $800 today, a decline of more than 40 percent.
DACCS and ERW compete in the same buyer portfolios for the durable-removal allocation. A credible path to $450 DACCS by 2030 sets a ceiling reference for every other durable pathway: ERW, biomass-based removals and mineralisation projects will all be benchmarked against that trajectory when buyers negotiate long-dated offtakes today. For sellers, signing large deals now, before cost curves compress, secures revenue at current price levels. For buyers, the trade-off runs the other way: locking in volume early guarantees supply in a thin market, but risks paying above the future clearing price.
What This Means for Buyers, Developers and Investors
For corporate buyers, the deal confirms that hyperscaler demand for durable removals continues to set the market’s frontier. Companies building net zero portfolios should expect competition for high-integrity ERW and DACCS supply to intensify, and should treat offtake negotiation timing as a strategic variable, not a procurement afterthought.
For project developers, the signal is that scale and co-benefit stacking win mandates. The Brazilian project combines ERW with super pollutant abatement and agronomic benefits in a single offering. Developers able to bundle multiple verified climate outcomes per hectare, with conservative quantification, are best positioned as buyers consolidate around fewer, larger counterparties.
For investors, the forecast of DACCS costs falling to $450 per tonne by 2030 provides a discount-rate input for every engineered-removal business plan. Revenue models that assume today’s $800 average persists should be stress-tested against the compressed curve.
What to Watch
Three markers will show whether this week marks an inflection. First, disclosure: whether the volume, price or delivery schedule of the Google offtake becomes public, which would give the ERW category its first flagship price reference. Second, replication: whether other large buyers sign comparable ERW deals in Brazil or in other basalt-rich, agriculture-intensive regions such as India. Third, methodology and verification: at 200,000 hectares and above, measurement of field-level weathering rates becomes the binding constraint, and the first large-scale verification cycles for this project will set precedents for the entire ERW category.
