Our Carbon Commitment
Measuring our footprint and purchasing carbon credits
Last updated: July 2026
Letter AI is committed to understanding and mitigating our environmental impact. We are currently partnering with Aclymate, a leading climate management platform, to conduct a comprehensive assessment of our carbon footprint.
While this evaluation is underway, we have proactively initiated emissions offsetting. Through CNaught, a science-backed carbon credit procurement platform, we are funding high-integrity climate projects. Transparency is central to our sustainability goals; you can track our ongoing contributions on our verified impact page.
Four principles guide our approach
01
Full-scope accountability
02
Reduce first, then buy credits
03
High-integrity, diversified credits
04
Transparency
How We Measure Our Footprint
We are actively calculating our precise carbon footprint with Aclymate, a carbon-accounting platform that combines software with help from their team to track Scope 1, 2, and 3 emissions. The majority of our emissions are indirect, which is normal for a software company with a distributed team: cloud and AI compute, software vendors, travel, and people's home offices. Our measurement covers all of these. Here's how each scope is handled:
Where We Are Today
The measurement of our exact carbon footprint with Aclymate is still underway. In the meantime, we have purchased a preliminary round of credits through CNaught to partially offset our footprint, which you can see on our impact page. Once we have calculated our exact carbon footprint, we will purchase the correct amount to offset it, and reset that number each year.
The Carbon Credits We Purchase
We buy our credits through CNaught. Instead of putting everything into one project, we fund a mix of projects that CNaught picks and manages for us.
Why a Mix of Projects
CNaught builds the portfolio around the Oxford Principles for Net Zero Aligned Carbon Offsetting, a 2024 framework that's become a common reference for credible offsetting. Spreading money across projects helps in a few ways:
Lower risk: If one project underdelivers, the others still count.
Broader impact: Projects in different places and of different kinds, with benefits for local communities and ecosystems.
Reasonable cost: Mixing cheaper and pricier project types keeps the average price per tonne sensible.
More removals over time: The mix shifts toward long-term carbon removal as those projects become more available.
Our current portfolio mix
As of our most recent (preliminary) purchase; the live impact page is always the most current source.
Project Categories
The Oxford Principles sort projects into five categories. Ours currently span four of them: I, II, IV, and V. Category III isn't widely available yet, so we'll add it as that changes.
I
Technology-based Reductions
Reducing or avoiding emissions through technology, such as landfill gas capture, refrigerant destruction, and natural-gas leak repair.
In portfolio
II
Nature-based Reductions
Protecting natural carbon stores that are at risk, such as avoided deforestation and peatland conservation.
In portfolio
III
Capture and Storage
Capturing carbon at an industrial source and storing it long-term. Few credits exist today.
Added as it scales
IV
Nature-based Removals
Pulling carbon out of the air through nature, such as reforestation and tidal-wetland restoration.
In portfolio
V
Technology-based Removals
Pulling carbon out of the air through engineered methods, such as biochar, direct air capture, and bio-oil sequestration.
In portfolio
Quality and Verification
Before a project goes into the portfolio, CNaught runs it through a seven-step review that pairs its own assessment with independent outside ratings. The review follows the Offset Guide from the Stockholm Environment Institute and the GHG Management Institute. In practice, CNaught:
Checks each project against the four main rating agencies: BeZero, Calyx Global, Renoster, and Sylvera.
Looks at the four things that drive quality: additionality, over-crediting, durability, and double counting.
Monitors each project after purchase and follows standards bodies like the Integrity Council for the Voluntary Carbon Market (ICVCM), adjusting the portfolio as guidance changes.
Stands behind every purchase with the CNaught Guarantee: if a project is canceled or suspended for over a year within three years of purchase, the affected credits are replaced from another high-integrity portfolio at no additional cost.
Our Commitment Each Year
Measure
Measure our footprint with Aclymate and report the result on our impact page, at least once a year.
Reduce
Cut emissions first where we can: cloud usage, vendor choices, and travel.
Offset
Purchase credits through CNaught to offset what's left of our footprint.
Remove
Move toward removals by shifting more of our credits to long-term removal as those projects grow.
Questions about any of this?
Reach out to Letter AI or view our impact page.
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