Inside our latest purchase round
Helping companies push through the messy middle.
Our most recent seven-figure purchase round focused on helping projects bridge the gap between promise and proof.
The funding made it possible for companies to complete first deployments, finalize measurement and verification, validate work outside the lab, and build confidence with buyers. This early capital is crucial because it enables the operational work that moves solutions from promising ideas to evidence-backed businesses.
The sixteen teams in this round are pushing the boundaries of what’s possible in greenhouse gas removal, abatement and destruction: Capture6, Charm, Circular Impact, Climeworks, Deep Sky, Graphyte, Heirloom, Mafix, Octavia Carbon, Planetary Technologies, Sinkco, Spiritus, StratX, TerraFixing, Terraton, and Vaulted Deep.
Let’s dive into a few of them.
When we say this round helped projects push through the messy middle, it’s not hyperbole. Here’s what it looked like in practice.
Graphyte — Biomass carbon removal through durable carbon casting
The market constraint
Biomass-based carbon removal is well understood scientifically, but many approaches struggle to demonstrate long-term durability and verifiable storage at a scale buyers can trust.
What donor capital unlocked
This purchase supported Graphyte as it moved from pilot operations toward commercial readiness. Early demand helped advance storage verification, MRV, and delivery milestones bridging the gap between proof-of-concept to market-ready removals.
Why it matters for the market
Clear standards for durability and verification are essential for the broader removal market. Graphyte’s progress establishes benchmarks for permanence, monitoring, and delivery that future buyers can reference, lowering uncertainty for the broader biomass pathway.
This purchase also enabled the first resale through Terraset’s Revolving Fund. Graphyte credits were purchased by Wren, demonstrating how early philanthropy and later market demand can work together to recycle donor dollars and move technologies from potential to proof.
Mafix — Enhanced rock weathering with next-generation mineral fertilizers
The market constraint
Enhanced rock weathering has strong scientific foundations, but early projects often stall because of slow weathering rates which leads to expensive measurement and verification.
What donor capital unlocked
Support at this stage allowed Mafix to validate measurement and verification of a novel, fast-weathering material during its pilot phase, rather than waiting for a larger, more capital-intensive demonstration. That early work helped translate laboratory science into credible, field-based evidence.
Why it matters for the market
Fast-weathering alkalinity unlocks rapid scaling. Progress here strengthens confidence in enhanced rock weathering as a whole and reduces risk for future buyers and funders.
StratX - Methane abatement + enhanced rock weathering for uncovered landfills (pre-deployment)
The market constraint
Combining methane abatement with enhanced rock weathering remains underdeveloped, particularly in the Global South. While key elements of StratX’s approach have been validated in controlled settings, the pathway still lacks a clear route to real-world deployment and buyer-grade evidence to support continued development.
What this support unlocks
Support at this stage marked StratX’s first sale, demonstrating early demand if this model is validated outside of the lab as StratX moves into first pilots. The focus for StratX now is field readiness: securing pilot partners (planned sites in Tanzania and Colombia), deploying enhanced biocovers that combine methane-oxidizing microbes with alkaline minerals to drive enhanced weathering, and generating early measurement evidence using established methods as the team develops its next-gen monitoring approach.
Why it matters for the market
Early proof matters for emerging pathways. If pilots can generate credible, buyer-grade evidence, it reduces uncertainty for future developers, buyers, and funders and helps validate whether landfills can support integrated methane abatement and carbon removal approaches at scale, including potential co-benefits like reduced runoff/leachate and local environmental improvements.
The lesson from this round is clear: early capital still plays an outsized role in shaping climate outcomes. Terraset will keep moving it.