Why did Microsoft’s emissions jump 25% — on purpose?
Microsoft's 2026 sustainability report carries the company's highest emissions total ever — 20.3 million tonnes, up 25% in a year. Episode 1 shows why a large slice of that jump is an accounting confession, and why it raises the bar for every corporate clean-power claim.
One report, two stories
On July 9, Microsoft published its 2026 Environmental Sustainability Report — and depending on which post crossed your feed, you read one of two stories. Story one: Microsoft is quietly winning — 100% renewable-matched, water positive for the first time, 45 million tonnes of carbon removal contracted in a year. Story two: Microsoft's emissions just jumped 25% to 20.3 million tonnes, the highest total it has ever reported.
Both stories come from the same report — and the second is the company's own headline number. The strangest part, and the episode's thesis: a large slice of that jump exists because Microsoft chose to stop flattering its own numbers.
Where the 25% actually sits
The numbers live in the appendix — Microsoft's Environmental Data Fact Sheet, with FY2025 data reviewed by Deloitte. Table 1B: total emissions rose from 16.2 to 20.3 million tonnes. Scope 1 (fuel burned directly) is under one percent. Scope 3 — the concrete, steel, servers and chips of the datacenter buildout — is about 86% of the footprint at 17.4 million tonnes. Amazon reported a 16% rise for the same period; Google a reported 18%. So far, a familiar story: AI grows, emissions grow.
But growth explains only part of the 25%. The interesting move is in Scope 2 — purchased electricity. Last year it was under 2% of the reported footprint. This year: 13%. Electricity use grew 24%; reported electricity emissions grew more than tenfold. That does not happen in the physical world. It happens on paper.
Physics vs paperwork
Every large company reports electricity emissions two ways. Location-based: take the grid you actually plug into, apply its average intensity — that is physics. Market-based: subtract the clean-power contracts you signed — that is paperwork. On the physics ledger, Microsoft's electricity emissions rose from 10.0 to 12.0 million tonnes, tracking its load growth. On the paperwork ledger they went from roughly 260,000 tonnes to 2.7 million — more than ten times higher. Same company, same electrons.
The decision doing all the work
In February 2025, Microsoft stopped buying spot renewable energy certificates from projects that already exist — "non-additional" paper, in its own words — and stopped publishing the annual carbon-neutral metric it had carried for years. The bridge math: of the +4.1 Mt total jump, ~1.6 Mt is the Scope 3 buildout and ~2.5 Mt sits in Scopes 1–2, where the REC exit and load growth are tangled together. Had Microsoft kept buying spot RECs as before, the episode's labelled counterfactual puts the headline near +10%, not +25%.
The pushback
The episode gives the critics the floor, in the style Carbon Market Watch has used on corporate claims for years. First: the physics still moved the wrong way — location-based electricity emissions rose 21%. Second: the target is absolute. Carbon negative by 2030 means removals exceed emissions in 2030, and Microsoft now sits roughly 58% above its own baseline with four years to go; the 45 Mt of contracted removal arrives over decades, not by 2030. Third: recent signals point both ways — an April report of paused future removal purchases (no cancellations, per the company), a May report that the 24/7 carbon-free electricity pledge is under review, and a June 20-year agreement with Chevron for a 2.67 GW gas plant in Texas dedicated to datacenters. Gas for two decades, sitting next to a carbon-negative pledge.
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The episode's read — labelled as a read, not a fact: the REC pause is the most consequential line in the report, and the right call. Much of the corporate market still leans on spot certificates; when the market's most-watched buyer walks away and calls them non-additional, the bar rises for everyone's Scope 2 claim. But honesty about the ledger does not bend the curve — that takes the 40 GW of contracted renewables (19 online today) and the removal portfolio outrunning the buildout, which the current numbers do not show.
The takeaway for any operation buying RECs, offsets or clean power: additionality tests are tightening everywhere — price that in before your auditor does. And read every emissions headline the way the episode reads this one: split the physics from the paperwork. Disclosure: Climate Decode assesses carbon removal projects and advises buyers in these markets, including some pathways named in the episode.
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Sources
- Microsoft 2026 Environmental Sustainability Report & Environmental Data Fact Sheet (Table 1B; FY2025 data reviewed by Deloitte).
- Microsoft Data Fact Sheet, Section 1 — discontinuation of spot EAC and existing-project credit purchases (February 2025).
- Amazon and Google 2025/2026 sustainability disclosures — reported year-over-year emissions changes.
- New York Times (April 2026) — reported pause on future carbon removal purchases.
- Bloomberg (May 2026) — 24/7 carbon-free electricity pledge under review.
- Microsoft–Chevron announcement (June 2026) — 20-year, 2.67 GW natural gas agreement, Texas.
- Microsoft carbon removal contracting disclosures — 45+ Mt across 29 projects, 10 pathways; 40 GW renewables contracted, 19 GW online.
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