
About MCJ Collective
MCJ Collective drives collective creativity for climate solutions by breaking down silos and unlocking problem-solving potential.
- 📌 Boston, Massachusetts, United States
- 👥 1-10
- 📊 Venture Capital
- 🌟 Early Stage Venture, Late Stage Venture, Seed
- 🌐 www.mcjcollective.com
About Heirloom
Heirloom, a direct air capture company permanently removing CO2 from the atmosphere
- 📌 San Francisco, California, United States
- 👥 101-250
- 📊 Grant
- 🌟 Private
- 🌐 www.heirloomcarbon.com/
Our Investment in Heirloom
Focus on Climate Crisis Solutions
We’ve previously shared our interest in businesses built around innovative solutions that directly address the climate crisis.
Like many others, we believe solutions like direct air capture and negative emissions are not “nice-to-haves” but instead are mission critical for mitigating the worst effects of climate change.
Whether it’s sequestering carbon dioxide underground at scale through liquified biomass (as portfolio company Charm Industrial is pursuing) or retrofitting cooling towers to remove carbon from ambient air (as recent portfolio company Noya is endeavoring), we’re fascinated by and optimistic about carbon removal solutions that cost-effectively sequester CO2 at gigaton-scale.
We evaluate opportunities within this space through a framework incorporating scaling potential, unit economics and costs, and technical feasibility. Fortunately, an increasing number of technologies and young companies are emerging that check these boxes.
One such company that fits this profile is Heirloom, which we’re excited to announce MCJ Collective is backing.
Founded by Shashank Samala and Noah McQueen, Heirloom is commercializing research developed at several leading research universities to create “carbon farms” that utilizes a naturally occurring mineralization process to capture and store CO2 more affordably.
Introducing Heirloom
San Francisco-based Heirloom is a direct air capture company founded on research that investigated the natural process of mineralization, specifically the chemical reaction that leads oxides to capture CO2.
The basis of Heirloom’s technology is a system that cycles oxides through carbon-containing ambient air (a process known as “weathering”) where it absorbs CO2 and becomes carbonate.
The carbonate then passes through a calciner where the CO2 is removed, producing magnesium oxide that is recycled through the process.
An activity that normally might take years to occur in nature, mineralization happens in days thanks to Heirloom’s technology.

Heirloom’s has devised a “looping” direct air capture process by which magnesium oxide is passively exposed to ambient air (“weatherized”), captures CO2, and then recycles through the process again.
Integrating components from existing DAC technology, Heirloom envisions its carbon farms will be able to scale to gigatons of carbon removal per year by 2035.
Moreover, it believes that the materially lower energy and heat requirements and lower input costs will translate into a meaningfully cheaper removal and storage cost, as low as $60/tCO2.
To date, this cost has been one of the lingering barriers to widespread DAC adoption.
By significantly reducing removal costs, the team believes it can offer a compelling supply of verifiable carbon offsets to companies of all sizes in the voluntary and compliance markets.
Reason Behind Investment
Founder Fit
Noah, Heirloom’s Head of Research, has spent the last 4 years working with Jen Wilcox’s lab, helping to drive the bleeding edge of Direct Air Capture and Carbon Mineralization research.
Noah has led or contributed to over 10 peer reviewed publications on the broader carbon removal space, including as lead author of the foundational Nature paper on Heirloom’s approach.
He also has extensive experience building Techno-economic Analyses and Life Cycle Analyses for a variety of carbon removal approaches.
The combined experience in entrepreneurship, scaling technologies, and scientific research make this an ideal founder fit.
The Underlying Science Offers Confidence
Conclusion
The vision for Heirloom strikes the critical notes for commercializing carbon removal: sequestering gigaton-scale quantities of CO2 at a diminishing cost over time and serving a carbon offset market for which demand is rapidly growing.
The sheer quantity of CO2 that needs to be removed from the atmosphere leads us to believe that this is not a winner-take-all market.
Rather, we believe a panoply of compelling technologies will gain traction, and that Heirloom is well-positioned to take on a leading role in the drawdown of atmospheric carbon.
You can read the rest of “Why we invested in” collection here:
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