Why Microsoft Slashed Carbon Removal Purchases by 80% in 2026 — and What the Crew Carbon Deal Really Means

In the first half of 2026, Microsoft did something it hadn't done in three years: it dramatically pulled back from the carbon removal market. The company bought just 8.55 million metric tons of carbon removal credits through mid-July, a roughly 80% reduction compared to the same period in 2025, according to calculations by BloombergNEF . The primary driver is a massive redirection of capital toward artificial intelligence infrastructure. Microsoft is aggressively building AI data centers, which has pushed its emissions higher and consumed budget that previously went into large-scale carbon credit offtakes . The company told some suppliers it was "adjusting the pace" of its acquisitions, and Microsoft's emissions have risen roughly 25% in recent years due to AI-related energy demand, further complicating its sustainability math .

Yet in August 2026, Microsoft signed a new carbon removal offtake agreement with Brooklyn-based startup CREW Carbon — a deal that, at first glance, seems to contradict the broader pullback. A closer look reveals it is not a contradiction but a window into Microsoft's new, more selective strategy.

The AI-Driven Retreat from Carbon Markets

Microsoft entered the carbon removal market in 2020 and quickly became its dominant corporate buyer, accounting for as much as 90% of global voluntary carbon removal purchases at its peak . In 2025 alone, the company contracted 45 million metric tons of credits, double its 2024 volume and nine times its 2023 figure .

The 2026 retreat was not sudden. In April 2026, Microsoft began informing partners and suppliers that it was pausing new purchases of carbon removal credits . The New York Times reported that the carbon removal industry was "reeling" as Microsoft stepped back from the market it helped create . Chief Sustainability Officer Melanie Nakagawa said the company's decarbonization program had not ended, noting that "at times we may adjust the pace or volume" of purchases .

The underlying reason is clear: Microsoft's spending on AI infrastructure has exploded. From April to June 2026 alone, the company spent $41 billion, with the majority directed toward AI initiatives and data center construction, on track for roughly $175 billion in AI infrastructure spending for the full year .

The Crew Carbon Exception: Small, Targeted, and Strategic

On August 4, 2026, CREW Carbon announced an offtake agreement with Microsoft for the delivery of up to 23,602 durable, verified carbon removal units (CRUs) generated through the company's patented wastewater alkalinity enhancement (WAE) technology . The technology integrates with existing wastewater treatment infrastructure and converts atmospheric CO₂ into stable bicarbonates that are permanently stored in the water stream .

This deal is the third carbon removal purchase Microsoft has made since announcing its slowdown, confirming the company has not exited the market — it has simply become far more selective .

What the Crew deal signals about Microsoft's strategy:

• Precision over volume. At roughly 23,600 tons, this is tiny relative to the millions of tons Microsoft contracted in prior years. It signals Microsoft is still making selective bets on novel, durable removal methods — but at a fraction of its previous purchasing pace .

• Portfolio diversification. Crew's method is a distinct pathway — ocean alkalinity enhancement via wastewater infrastructure — that adds technological diversity to Microsoft's CDR portfolio without requiring a massive capital commitment .

• Low-cost, high-durability removal. Wastewater-based alkalinity enhancement is relatively low-cost and offers permanent storage as bicarbonates, aligning with Microsoft's stated preference for high-durability credits . Phillip Goodman, Microsoft's Carbon Removal Portfolio Director, called the approach "highly durable and measurable" with "high Monitoring, Reporting and Verification (MRV) certainty" .

• Market validation for a novel approach. The agreement extends CREW's total committed carbon removal value past $40 million, building on existing long-term contracts with corporate buyers including JPMorgan, Google, Autodesk, and Stripe via Frontier . Microsoft's endorsement provides significant credibility for wastewater-based carbon removal as a viable pathway.

What This Means for the Carbon Removal Market

Microsoft remains by far the largest single buyer in the voluntary carbon removal market, but its 80% purchasing cut represents a severe demand shock for a sector that has grown heavily dependent on the tech giant's appetite for credits . The company's pullback has forced developers, investors, and policymakers to reassess the market's reliance on a single corporate buyer.

At the same time, the Crew Carbon deal shows that Microsoft is not walking away from carbon removal entirely. It is making smaller, more targeted investments in technologies it considers promising — especially those with low cost, high durability, and the ability to integrate with existing infrastructure. The company's carbon removal program is not dead; it is being recalibrated.

"Our decarbonization approach combines reduction, removal and efficiency, and carbon removal is one piece of that equation," Nakagawa said in a statement . The Crew deal suggests the "removal" piece still has a place at Microsoft — but it now has to compete with AI for every dollar.