What we do / Impact Investments
CDR Portfolio
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3. Impact Investments
Backing Bold Startups Tackling the Climate Crisis
The significant risks associated with climate startups that aim to develop groundbreaking technologies to address the climate crisis should be shouldered by the public. Unfortunately, this isn’t the case, at least not yet.
By providing capital to CDR startups at the angel-funding/pre-seed stage we are helping to find out, which CDR concepts will work and scale in the future. Currently most people think we will need a whole set of CDR methods to reach the necessary carbon removal amounts by mid-century. But for many methods the word is still out if they work and if they scale. Through these early-stage investments we bridge the critical gap until other, larger actors take on their necessary role. By doing so, we assume risks that few others are prepared to bear. Our goal is to advance the science, technology, and organizations essential for the carbon dioxide removal (CDR) industry as early as possible.
One of the most important insights for each method is: How far can we get with it. Because when we find out that an idea doesn’t work, then we need to know as early as possible and then we need to double down in the remaining ideas!
Our Portfolio in Numbers
Since 2020 we have invested in more than 30 companies. In our 2026 survey they reported:
- 961 employees across the portfolio
- 806,000 t of CO₂ removed and delivered by the end of 2025
- 55% of the companies have already issued verified CDR certificates to buyers
The whole industry is small. Captain Drawdown, the AI assistant we built to track the CDR sector, puts the workforce of all pure-play CDR companies worldwide at 10,000 to 25,000 people. The 961 people in our portfolio are 5 to 10% of them. The 806,000 tonnes are about 5% of the roughly 15 million tonnes the industry delivered in 2025. How we arrived at these numbers.
Where Our Portfolio Companies Are
The portfolio companies are based or active in 21 countries:
- Albania Metalplant
- Austria Sequestra, SYNCRAFT
- Belgium Sirona Technologies
- Brazil InPlanet
- Cameroon Carbonsate
- Colombia Carbonsate, Cotierra
- Denmark Rock Flour Company
- France Bloomineral
- Germany Aeroc, Carbonfuture, Climeworks, Co-reactive, Everest Carbon, NeoCarbon, Planeteers
- Greenland Rock Flour Company
- Iceland Climeworks
- India Everest Carbon
- Ireland Silicate
- Kenya Cella Mineral Storage, Flux, Octavia, Sirona Technologies, ZEN Carbon
- Mexico Silica
- Namibia Carbonsate
- Oman 44.01
- Switzerland Altitude Carbon, Climeworks
- Thailand Happy Ground
- United Arab Emirates 44.01
- United States Climeworks, CREW Carbon, Eion, Everest Carbon, Lithos Carbon, Silicate, Subtidal, Syntopa
Our CDR Portfolio
The table lists 30 of them. Some of our investments are not public or no longer public. The employee numbers are from the end of 2025. Not every company discloses them. Where we have published a Portfolio Spotlight on a company, its row links to the post.
| Company | Employees (end of 2025) | What They Do | Region(s) of Activity | |
|---|---|---|---|---|
 | 44.01 | 65 | Underground carbon storage | Oman, UAE |
 | AerocPortfolio Spotlight | MRV Infrastructure for ERW | Globally | |
 | Altitude Carbon | 5 | Carbon negative aviation fuel | Globally |
 | Bloomineral | Mineralization | France | |
 | CarbonfuturePortfolio Spotlight | 40 | Digital Monitoring, Reporting, Verification & Marketplace Infrastructure | Globally |
 | Carbonsate | Biomass burial | Namibia, Cameroon, Colombia | |
 | Cella Mineral StoragePortfolio Spotlight | Underground carbon storage | Kenya | |
 | ClimeworksPortfolio Spotlight | 480 | Direct Air Capture (DAC) | Switzerland, Germany, Iceland, USA |
 | Co-reactivePortfolio Spotlight | CO2 storage in concrete | Europe | |
 | CotierraPortfolio Spotlight | Biochar | Latin America | |
 | CREW CarbonPortfolio Spotlight | 10 | Carbon mineralization in water treatment plants | USA, Europe |
 | Eion | 15 | Enhanced Rock Weathering (ERW), acquired by Terradot | USA |
 | Everest CarbonPortfolio Spotlight | Monitoring for Enhanced Rock Weathering (ERW) | USA, EU, India | |
 | FluxPortfolio Spotlight | 15 | Enhanced Rock Weathering (ERW) | Africa (HQ in Kenya) |
 | Happy GroundPortfolio Spotlight | Biochar | Asia (Thailand) | |
 | InPlanetPortfolio Spotlight | 38 | Enhanced Rock Weathering (ERW) | Brazil |
 | Lithos Carbon | 25 | Enhanced Rock Weathering (ERW) | North America |
 | Metalplant | Enhanced rock weathering combined with nickel phytomining | Albania | |
 | NeoCarbonPortfolio Spotlight | Direct Air Capture (DAC) with industrial waste heat | Germany | |
 | OctaviaPortfolio Spotlight | 60 | Direct Air Capture (DAC) | Kenya |
 | PlaneteersPortfolio Spotlight | 15 | Carbon mineralization in water treatment plants | Germany |
 | Rock Flour CompanyPortfolio Spotlight | Glacial dust for ERW | Greenland | |
 | SequestraPortfolio Spotlight | Carbon storage with industrial waste materials | Austria | |
 | Silica | Enhanced Rock Weathering (ERW) | Mexico | |
 | Silicate | 10 | Enhanced Rock Weathering (ERW) | Ireland, USA |
 | Sirona Technologies | Direct Air Capture (DAC) | Belgium, Kenya | |
 | Subtidal | 4 | Monitoring for marine CDR (mCDR) | North America, Europe |
 | SYNCRAFTPortfolio Spotlight | Reverse power plants, biochar | Austria | |
 | SyntopaPortfolio Spotlight | 7 | Bacteria-based acceleration of Enhanced Rock Weathering (ERW) | North America |
 | ZEN CarbonPortfolio Spotlight | CO2 storage in concrete | Kenya | |
Our non-ERW CDR portfolio companies grouped by technology focus
These companies do not work on enhanced rock weathering (ERW). They capture CO₂ from the air or through biomass, or they store it underground, in building materials, in water or as biochar. Each card names where the CO₂ comes from, what the process needs and where the carbon ends up.
Direct Air Capture capture-focused, storage handled separately
Geological storage agnostic to CO₂ source
Stored in concrete & building materials
Stored in water/ocean as bicarbonate
Biomass burial & biochar biological capture, solid storage
The three areas of our work
1. Scientific Research
Field and greenhouse experiments on enhanced rock weathering since 2020.
2. Policy Advocacy
Four organisations we co-founded or support, in Brussels, Berlin, Delhi and worldwide.
3. Impact Investments
Early-stage investments in more than 30 carbon removal companies since 2020.
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