Microsoft's recent agreement with Alt Carbon underscores the growing importance of both direct carbon removal technologies and emerging markets in achieving climate goals. This isn't simply an environmental initiative; it demonstrates the increasing scrutiny and technical rigor being applied to carbon credit verification, and the potential for scalable, nature-based solutions.
What Happened
Microsoft has signed a three-year agreement to purchase 36,920 metric tons of carbon dioxide removal credits from Alt Carbon, an Indian startup specializing in enhanced rock weathering. The credits will be generated by Alt Carbon’s Darjeeling Revival Project in eastern India, with delivery expected by 2029. This marks Microsoft’s first enhanced rock weathering deal in Asia. The agreement includes an option for Microsoft to purchase additional credits based on performance. Notably, Microsoft required more stringent monitoring, reporting, and verification (MRV) measures than standard registry requirements, including expanded data sharing and carbon quantification protocols.
Alt Carbon uses crushed basalt rock spread on farmland to accelerate natural carbon capture processes. The company currently issues credits through the Isometric registry, which has a specific methodology for enhanced rock weathering. Alt Carbon claims to be the world’s largest issuer of credits from this method, having already issued nearly 10,000 credits, with another 15,000 expected by the end of 2026. This deal follows previous reporting about Microsoft potentially pausing some carbon removal procurement, which the company denied, stating a continued commitment to its sustainability goals.
Why It Matters
This deal is significant for several reasons. First, it validates enhanced rock weathering as a viable – and verifiable – carbon removal technique. The fact that Microsoft, a major purchaser of carbon credits, demanded and received additional MRV measures suggests increasing confidence in the methodology. Second, it highlights India’s growing importance in the carbon removal space. Developers from the Global South now represent 26% of all carbon removal credit issuances, up from just 2% in 2022, indicating a shift in the geography of carbon removal projects.
For developers, the increased demand for verified carbon removal credits creates a market opportunity, but also a higher bar for entry. The emphasis on robust MRV – specifically the expanded data-sharing and quantification protocols requested by Microsoft – suggests that simply claiming carbon removal will no longer be sufficient. Furthermore, the deal showcases the importance of working with established registries like Isometric that have developed specific methodologies for emerging carbon removal technologies. The requirement for additional data and verification will likely drive innovation in monitoring technologies and carbon accounting practices.
What To Watch
It will be crucial to monitor how Alt Carbon scales its operations and maintains the integrity of its carbon removal claims. The success of this project could pave the way for wider adoption of enhanced rock weathering in India and other regions. Furthermore, it remains to be seen how Microsoft’s sustainability strategy evolves and whether they will continue to prioritize deals with suppliers offering high levels of transparency and verification. The broader carbon market needs continued development of standardized MRV approaches. Finally, the impact of this deal on the price and availability of carbon removal credits needs to be observed, as increased demand could drive up costs.