AI’s use of energy-intensive data centers will be the primary cause of its growing environmental impact as it continues to expand rapidly. Microsoft, a pioneer in cloud computing and artificial intelligence, announced that its greenhouse gas emissions increased by 23.4% between 2020 and 2023, reaching 17.2 million metric tons of CO₂. As a solution, Microsoft uses human waste to offset AI’s carbon emissions by injecting organic waste deep underground for long-term carbon storage.

Microsoft Uses Human Waste to Offset AI’s Carbon Emissions: The Vaulted Deep Partnership

Microsoft announced a 12-year agreement with Vaulted Deep, a U.S.-based waste management startup specializing in biomass carbon removal and storage (BiCRS), effective in 2025, to offset its growing carbon footprint. By 2037, this agreement aims to inject treated organic waste, such as manure, food waste, and human biosolids, into deep wells to sequester 4.9 million metric tons of CO₂.

The process used by Vaulted Deep traps carbon that is released into the atmosphere during the breakdown of organic matter. The decomposing waste is transformed into a slurry and pumped more than 5,000 feet below the Earth’s surface into geologically stable, impermeable rock formations, as opposed to being released into the atmosphere. To secure carbon for over 10,000 years, this technique was modified from procedures used in the oil and gas industry.

Microsoft uses the carbon reduction credits generated by each metric ton of garbage buried underground to offset emissions related to its data centers and international activities.

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How Vaulted Deep’s Technology Works

Vaulted Deep’s approach, known as biomass carbon removal and storage, is based on a natural principle: plants absorb CO₂ through photosynthesis and store it in organic matter. When this matter—like food scraps, sewage, or manure—decomposes, it releases CO₂ or methane. Instead, Vaulted Deep collects and processes this waste into a carbon-rich slurry and injects it deep into rock formations. These formations, capped with impermeable layers, trap the carbon for millennia.

This process is already underway in cities such as Los Angeles and Derby, Kansas, and has sequestered more than 18,000 metric tons of CO₂. The removals are independently verified by Isometric, ensuring high integrity and transparency.

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The Advantages of Microsoft’s Unconventional Strategy

The method through which Microsoft uses human waste to offset AI’s carbon emissions comes with notable benefits:

The approach not only helps offset emissions but also mitigates other environmental problems, such as landfill methane, overfertilization, and contaminated waste disposal.

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Microsoft’s Broader Sustainability Commitments

This carbon removal effort is part of a much larger climate strategy. Microsoft has pledged to become carbon negative by 2030 and to remove all historical emissions by 2050. In FY2024, the company contracted for 21.9 million metric tons of carbon removals, of which Vaulted Deep accounts for 4.9 million metric tons over 12 years.

Beyond carbon storage, Microsoft is investing in:

• A $1 billion Climate Innovation Fund for emerging technologies.
• Over 34 GW of renewable energy projects across 24 countries.
• Construction materials with lower embodied carbon, such as hybrid timber-steel structures.
• Mandating suppliers to transition to 100% carbon-free electricity by 2030.

Even while Scope 1 and 2 emissions have decreased by 10%, Scope 3 emissions, which are primarily from building and supply chains, remain substantial at 16.6 million metric tons CO₂e. Microsoft can balance problems with hard-to-abate industries while also promoting modular solutions that can scale by implementing carbon removal solutions, such as Vaulted Deep, where the company utilizes human excrement to offset AI’s carbon emissions.

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Risks and Concerns

This new procedure, combined with carbon removal, provides some new concerns:

• Groundwater contamination: Critics are concerned that deep injection can contaminate aquifers. Vaulted Deep uses strict site selection, sealed well designs, and monitoring to mitigate risks.
• Longevity of monitoring: Ensuring long-term storage over centuries or millennia requires ongoing regulation and oversight to maintain stability and ensure stability.
• Public acceptance: There may be opposition to the underground injection of waste.

However, these wells are regulated by the EPA’s Underground Injection Control (UIC) Program, which makes sure they adhere to safety regulations to safeguard groundwater supplies (EPA, 2024).

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FAQs

What is carbon removal, and why is it required?

Carbon removal involves capturing and storing CO₂ from the atmosphere to prevent global warming. The IPCC claims that carbon reductions alone will not be enough to keep global warming below 1.5°C, which makes it essential.

When organic waste is injected underground, how is carbon eliminated?

Plants absorb CO₂ and store it as organic matter, or biomass. When waste, like manure or food scraps, breaks down, greenhouse gases are released. Emissions are avoided, and the carbon is permanently sequestered by injecting it deep underground.

Is this method environmentally safe?

While there are risks, including potential groundwater contamination, Microsoft uses human waste to offset AI’s carbon emissions through a process that includes strict safety protocols, regulated site selection, and real-time monitoring systems.

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