26 Best Carbon Removal Startups to Watch in 2025

The Definitive Seedtable Ranking of Carbon Removal Startups

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 26 start-ups with an aggregate funding of $1.9b. The average funding per company in this subset is $73.6m.

Last update to the database: Feb 18, 2025. See changelog.

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10

Funding Rounds

$876.0m

Money raised

Climeworks is a clean technology company that has developed technology for carbon dioxide (CO2) capture from ambient air. It was founded in 2009 and is located in Zurich, Switzerland.

Location:

Key people:

3

Funding Rounds

$12.2m

Money raised

Capturing CO2 from the sky and re-selling it for 2x cheaper

Location:

Key people:

10

Funding Rounds

$14.4m

Money raised

Carbon capture and storage company founded in 2007 and based in Dartmouth, Nova Scotia, Canada. CarbonCure Technologies Inc. provides carbon dioxide sequestering technology to concrete plants in a system for recycling carbon dioxide waste from industrial emitters and incorporating it into concrete products.

7

Funding Rounds

$151.6m

Money raised

A carbon sequestration technology and bioplastics company based in Huntington Beach, California, founded in 2003, that uses their technology to capture carbon from greenhouse emissions for production of bioplastics.

9

Funding Rounds

$119.5m

Money raised

Carbon Engineering is building technologies to capture CO2 directly from the atmosphere, and to use that CO2 in the synthesis of clean transportation fuels that displace crude oil.

4

Funding Rounds

$105.0m

Money raised

Solidia Technologies is a Piscataway, New Jersey-based technology company offering solutions for using CO2 for manufacturing construction and industrial products.

3

Funding Rounds

$6.0m

Money raised

Carbon Upcycling Technologies Inc. is a Calgary-based carbon capture and storage company developing technologies to turn the carbon into building materials.

Location:

Key people:

3

Funding Rounds

$103.5m

Money raised

Charm Industrial is a company that works to produce reliable, cost-competitive hydrogen from biomass.

3

Funding Rounds

$53.0m

Money raised

Heirloom is a San Francisco-based environmental remediation company founded by Shashank Samala.

Key people:

3

Funding Rounds

$9.3m

Money raised

Carbon capture technology that reduces industrial CO2 emissions.

Location:

Key people:

1

Funding Rounds

$1.4m

Money raised

CERT is a Toronto-based carbon capture and storage company converting CO2 into chemical feedstocks and carbon-based fuels.

Location:

Key people:

2

Funding Rounds

$24.0m

Money raised

Brilliant Planet is a nature-based system capturing and storing carbon founded in 2013 by Raffael Jovine Ph.D.

2

Funding Rounds

$6.2m

Money raised

ecoLocked is a green concrete manufacturer founded in 2021.

1

Funding Rounds

$54.0m

Money raised

Climate technology focused on carbon removal by accelerated erosion of silicate rock.

3

Funding Rounds

$77.7m

Money raised

Agreena is a soil carbon program for farmers founded in 2018.

2

Funding Rounds

$42.0m

Money raised

44.01 is a mineralisation technology developer founded in 2020 by Talal Hasan.

Location:

Key people:

3

Funding Rounds

$166.0m

Money raised

Carbon capture and storage.

2

Funding Rounds

$10.0m

Money raised

Direct Air Capture (DAC) technology to remove carbon dioxide.

1

Funding Rounds

$25.0m

Money raised

Isometric is a carbon removal standard and registry.

3

Funding Rounds

$28.8m

Money raised

Supercritical is a carbon removal marketplace

1

Funding Rounds

ARK Capture Solutions is a carbon capture technology developer founded in 2024 by Samuel Thiry.

Key people:

1

Funding Rounds

$3.5m

Money raised

C2CNT is a Virginia-based developer of carbon capture and storage technology which uses the captured material to create carbon nanotubes.

1

Funding Rounds

$2.2m

Money raised

SeaO2 is a carbon (CO2) removal technology developer founded in 2021 by Ruben Brands.

Key people:

1

Funding Rounds

$6.5m

Money raised

CUR8 is a market-making platform for carbon removal.

Location:

1

Funding Rounds

$4.5m

Money raised

Patch helps clients make their businesses carbon neutral .

1

Funding Rounds

$10.0m

Money raised

Sustaera, Inc. is a Cary, North Carolina-based company founded in 2021.

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