Company lists · Data refreshed September 2026

Top 25 Carbon sequestration nonprofits worldwide

Name: Carbon sequestration nonprofits worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,837 companies tracked

RevenueBase identified 1,837 carbon sequestration nonprofits worldwide as of September 2026 and tracks 18,799 professional contacts across them, including 5,605 with verified work emails. The United States is the largest market and London the largest hub.

This list covers carbon sequestration nonprofits worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026. Country and city lists for carbon sequestration nonprofits follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

1,837Companies

18,799Contacts tracked

5,605Verified emails

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The 25 largest carbon sequestration nonprofits worldwide

Ranked by team size

Top 25 of 1,837 carbon sequestration nonprofits worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to carbon sequestration nonprofits: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Climeworks	Partial evidence	Opfikon, SwitzerlandHQ checked Sep 19, 2026	201-500	435 contacts →
	Partial evidence “Climeworks is a leading high-quality carbon removal provider, combining decades of expertise in Direct Air Capture (DAC) technology with holistic carbon removal solutions.” Source: RevenueBase Database · checked Sep 19, 2026
2	Ecosecurities	Indirect evidence	Geneva, SwitzerlandHQ checked Sep 19, 2026	51-200	406 contacts →
	Indirect evidence “EcoSecurities is a global leader in climate solutions, harnessing the power of nature, technology, and finance to accelerate decarbonisation efforts worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
3	WREN	Partial evidence	San Jose, CA, United StatesHQ checked Sep 19, 2026	n/a	240 contacts →
	Partial evidence “Wren Climate, PBC helps you live carbon neutral by accounting for and offsetting your carbon emissions through transparent climate projects.” Source: RevenueBase Database · checked Sep 19, 2026
4	Agreena	Partial evidence	Copenhagen, DenmarkHQ checked Sep 19, 2026	51-200	214 contacts →
	Partial evidence “Headquartered in Denmark, Agreena is powering the global transition to regenerative agriculture, operating Europe’s leading soil carbon programme.” Source: RevenueBase Database · checked Sep 19, 2026
5	Varaha	Indirect evidence	Gurugram, IndiaHQ checked Sep 19, 2026	51-200	213 contacts →
	Indirect evidence “Varaha is a leading global climate tech startup that specializes in nature-based solutions, including regenerative agriculture, agroforestry, and biochar projects that promote…” Source: RevenueBase Database · checked Sep 19, 2026
6	Milieudefensie	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	51-200	210 contacts →
	Indirect evidence “Onze missie?” Source: RevenueBase Database · checked Sep 19, 2026
7	EKI Energy Services LTD Enking International	Partial evidence	Indore, IndiaHQ checked Sep 19, 2026	201-500	203 contacts →
	Partial evidence “EKI Energy Services Ltd.(EKI), erstwhile EnKing International in the climate sector globally, is a leading Carbon Credit Developer & Supplier across the globe.” Source: RevenueBase Database · checked Sep 19, 2026
8	Carbon Clean	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	188 contacts →
	Partial evidence “Carbon Clean is the point-source carbon capture expert, driving the decarbonisation of hard-to-abate industries for more than 15 years.” Source: RevenueBase Database · checked Sep 19, 2026
9	Clean Foundation	Indirect evidence	Dartmouth, NS, CanadaHQ checked Sep 19, 2026	51-200	157 contacts →
	Indirect evidence “Clean Foundation helps the communities in which we work make real progress toward a cleaner future by taking on climate change challenges.” Source: RevenueBase Database · checked Sep 19, 2026
10	Netzero	Indirect evidence	Paris, FranceHQ checked Sep 19, 2026	51-200	151 contacts →
	Indirect evidence “NetZero's mission is to bring biochar at scale in the tropics – for climate and people, now.” Source: RevenueBase Database · checked Sep 19, 2026
11	Slipstream	Partial evidence	Madison, WI, United StatesHQ checked Sep 19, 2026	51-200	146 contacts →
	Partial evidence “We're a nonprofit headquartered in Madison, WI with an office in Chicago and remote staff across the U.S.” Source: RevenueBase Database · checked Sep 19, 2026
12	Green Carbon INC	Partial evidence	千代田区, JapanHQ checked Sep 19, 2026	51-200	136 contacts →
	Partial evidence “Founded in 2019, Green Carbon develops decarbonization projects together with farmers around the world.” Source: RevenueBase Database · checked Sep 19, 2026
13	Heirloom	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	51-200	111 contacts →
	Indirect evidence “Mitigating the worst impacts of climate change by developing the world’s most cost-effective DAC technology to permanently remove CO2 from the atmosphere.” Source: RevenueBase Database · checked Sep 19, 2026
14	Carboncure Technologies	Partial evidence	Dartmouth, NS, CanadaHQ checked Sep 19, 2026	51-200	100 contacts →
	Partial evidence “Concrete That Matters: CarbonCure Technologies is on a mission to empower cement and concrete producers with technologies and strategies to achieve the industry's net zero…” Source: RevenueBase Database · checked Sep 19, 2026
15	Greenstand	Partial evidence	Anchorage, AK, United StatesHQ checked Sep 19, 2026	11-50	84 contacts →
	Partial evidence “Greenstand is a U.S-based 501(c)(3) nonprofit organization developing open-source technology to address climate change and alleviate poverty through digitizing environmental goods…” Source: RevenueBase Database · checked Sep 19, 2026
16	Storegga	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	83 contacts →
	Partial evidence “Storegga, a business established in 2020 as an independent champion for the development of carbon reduction and carbon removal technologies.” Source: RevenueBase Database · checked Sep 19, 2026
17	Land Life	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	51-200	83 contacts →
	Indirect evidence “Nature restoration you can stand behind.” Source: RevenueBase Database · checked Sep 19, 2026
18	Mombak	Partial evidence	Sao Paulo, BrazilHQ checked Sep 19, 2026	11-50	81 contacts →
	Partial evidence “Mombak is working to become the world's largest and lowest cost carbon removal company, with a multi-pathway portfolio of solutions.” Source: RevenueBase Database · checked Sep 19, 2026
19	Kelp Blue	Indirect evidence	Amsterdam/luderitz, NetherlandsHQ checked Sep 19, 2026	11-50	81 contacts →
	Indirect evidence “We grow giant kelp forests around the globe to boost the health of the oceans and to store CO2.” Source: RevenueBase Database · checked Sep 19, 2026
20	Dextall	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 19, 2026	51-200	78 contacts →
	Indirect evidence “Our Mission: To accelerate decarbonization of the environment TODAY by bringing affordable and efficient solutions to build sustainably.” Source: RevenueBase Database · checked Sep 19, 2026
21	Neustark	Indirect evidence	Berne, SwitzerlandHQ checked Sep 19, 2026	11-50	75 contacts →
	Indirect evidence “Limiting global warming to 1.5°C implies reaching net zero CO2 emissions in 2050 according to the IPCC.” Source: RevenueBase Database · checked Sep 19, 2026
22	Carbonext	Partial evidence	São Paulo, BrazilHQ checked Sep 19, 2026	51-200	75 contacts →
	Partial evidence “Carbonext arose from the desire to make a difference.” Source: RevenueBase Database · checked Sep 19, 2026
23	Eagronom	Partial evidence	Tallinn, EstoniaHQ checked Sep 19, 2026	51-200	74 contacts →
	Partial evidence “Today, farming accounts for 15% of global greenhouse gas emissions, but we believe it could become carbon neutral.” Source: RevenueBase Database · checked Sep 19, 2026
24	Tradewater	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	51-200	73 contacts →
	Indirect evidence “A certified B Corp, Tradewater directly combats climate change by identifying, collecting, and eliminating the release of non-CO₂ superpollutants, including refrigerants in old…” Source: RevenueBase Database · checked Sep 19, 2026
25	Inplanet	Partial evidence	Munich, GermanyHQ checked Sep 19, 2026	11-50	70 contacts →
	Partial evidence “InPlanet is a leading ClimateTech start-up pioneering Enhanced Rock Weathering (ERW) as a measurable, scalable, and verified carbon removal solution.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: carbon sequestration nonprofits. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names carbon sequestration nonprofits.
Partial evidence: Its own public description names part of carbon sequestration nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon sequestration nonprofits. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,837 carbon sequestration nonprofits worldwide

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Carbon sequestration nonprofits worldwide at a glance

As of Sep 19, 2026

29.8%Verified-email coverage

10.2Average contacts per company

1-10Median size (employees)

4.2%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,195

11-50

531

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among carbon sequestration nonprofits, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for carbon sequestration nonprofits are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “carbon sequestration nonprofits”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names carbon sequestration nonprofits), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among carbon sequestration nonprofits, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 5,605 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 19, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Carbon sequestration nonprofits by location

10 lists · largest first

Every Carbon sequestration nonprofits list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names carbon sequestration nonprofits, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many carbon sequestration nonprofits are there worldwide?

RevenueBase identified 1,837 carbon sequestration nonprofits worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Climeworks, headquartered in Opfikon, tops this list with the largest team on record.

Which country has the most carbon sequestration nonprofits?

The United States leads with 350 companies, followed by the United Kingdom (145) and India (101). Every carbon sequestration nonprofits list by country and city is linked on this page.

Which city has the most carbon sequestration nonprofits?

London leads with 77 headquartered companies, followed by New York (29) and Paris (22).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 5,605 verified decision-maker contacts tracked across these 1,837 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.