Company lists · Data refreshed September 2026

Top 25 Environmental nonprofits worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 23,163 companies tracked

RevenueBase identified 23,163 environmental nonprofits worldwide as of September 2026 and tracks 223,626 professional contacts across them, including 59,812 with verified work emails. The United States is the largest market and London the largest hub.

This list covers environmental 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 environmental 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

23,163Companies

223,626Contacts tracked

59,812Verified emails

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The 25 largest environmental nonprofits worldwide

Ranked by team size

Top 25 of 23,163 environmental nonprofits worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental 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	The Nature Conservancy	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,526 contacts →
	Indirect evidence “Air, water, food, shelter, income: nature sustains every aspect of our lives.” Source: RevenueBase Database · checked Sep 19, 2026
2	Greenpeace	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	n/a	2,945 contacts →
	Indirect evidence “Greenpeace is comprised of 25 independent national/regional organisations in over 55 countries across Europe, the Americas, Africa, Asia and the Pacific, as well as a…” Source: RevenueBase Database · checked Sep 19, 2026
3	RSPB	Indirect evidence	Sandy, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,969 contacts →
	Indirect evidence “Passionate about nature, dedicated to saving it.” Source: RevenueBase Database · checked Sep 19, 2026
4	IUCN	Partial evidence	Gland, SwitzerlandHQ checked Sep 19, 2026	501-1,000	1,965 contacts →
	Partial evidence “IUCN, the International Union for Conservation of Nature, helps the world find pragmatic solutions to our most pressing environment and development challenges.” Source: RevenueBase Database · checked Sep 19, 2026
5	Conservation International	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	501-1,000	1,560 contacts →
	Indirect evidence “Since 1987, Conservation International has worked to spotlight and secure the critical benefits that nature provides to humanity.” Source: RevenueBase Database · checked Sep 19, 2026
6	World Resources Institute	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,359 contacts →
	Indirect evidence “WRI works to improve people’s lives, protect and restore nature and stabilize the climate.” Source: RevenueBase Database · checked Sep 19, 2026
7	Environmental Defense Fund	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,352 contacts →
	Strong evidence “We are Environmental Defense Fund, a leading environmental nonprofit focused on stabilizing the climate while helping build strong and healthy communities.” Source: RevenueBase Database · checked Sep 19, 2026
8	Casa Familiar	Indirect evidence	Albuquerque, NM, United StatesHQ checked Sep 19, 2026	n/a	1,132 contacts →
	Indirect evidence “Casa Familiar is a primary/secondary education company based out of 501 Atrisco Dr Sw, Albuquerque, New Mexico, United States.” Source: RevenueBase Database · checked Sep 19, 2026
9	Sierra Club	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	501-1,000	1,069 contacts →
	Indirect evidence “At the Sierra Club, we believe in the power of togetherness.” Source: RevenueBase Database · checked Sep 19, 2026
10	Natural Resources Defense Council Nrdc	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	501-1,000	942 contacts →
	Partial evidence “NRDC is the nation's most effective environmental action organization.” Source: RevenueBase Database · checked Sep 19, 2026
11	Student Conservation Association	Partial evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	795 contacts →
	Partial evidence “The Student Conservation Association (SCA) is the largest provider of hands-on environmental conservation programs for youth and adults.” Source: RevenueBase Database · checked Sep 19, 2026
12	NWG S.P.A	Indirect evidence	Prato, ItalyHQ checked Sep 19, 2026	n/a	766 contacts →
	Indirect evidence “Nata a Prato nel 2003 è oggi una delle più importanti realtà nel mercato della Green Economy.” Source: RevenueBase Database · checked Sep 19, 2026
13	Groundwork	Indirect evidence	Birmingham, United KingdomHQ checked Sep 19, 2026	1,001-5,000	750 contacts →
	Indirect evidence “Groundwork takes practical action to create a fair and green future in which people, places, and nature thrive.” Source: RevenueBase Database · checked Sep 19, 2026
14	Monterey BAY Aquarium	Partial evidence	Monterey, CA, United StatesHQ checked Sep 19, 2026	501-1,000	738 contacts →
	Partial evidence “The mission of the nonprofit Monterey Bay Aquarium is to inspire conservation of the ocean.” Source: RevenueBase Database · checked Sep 19, 2026
15	Oxfam Novib	Indirect evidence	The Hague, NetherlandsHQ checked Sep 19, 2026	201-500	708 contacts →
	Indirect evidence “Wij strijden voor gelijkheid en we staan achter de mensen die opstaan voor gelijkheid.” Source: RevenueBase Database · checked Sep 19, 2026
16	CDP	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	702 contacts →
	Partial evidence “As the founder of environmental reporting, we believe in transparency and the power of data to drive change.” Source: RevenueBase Database · checked Sep 19, 2026
17	Earthjustice	Indirect evidence	San Francisco, United StatesHQ checked Sep 19, 2026	501-1,000	672 contacts →
	Indirect evidence “Earthjustice is a non-profit public interest law organization dedicated to protecting the magnificent places, natural resources, and wildlife of this earth, and to defending the…” Source: RevenueBase Database · checked Sep 19, 2026
18	Ocean Park Corporation	Partial evidence	Hong Kong Island South, Hong KongHQ checked Sep 19, 2026	1,001-5,000	628 contacts →
	Partial evidence “Vision Statement: A world where we take action to conserve our environment and grow positively with nature.” Source: RevenueBase Database · checked Sep 19, 2026
19	Centre For Alternative Technology	Indirect evidence	Machynlleth, United KingdomHQ checked Sep 19, 2026	n/a	618 contacts →
	Indirect evidence “Mae Canolfan y Dechnoleg Amgen yn elusen addysg amgylcheddol sydd wedi bod yn rhannu atebion i faterion amgylcheddol ac ymchwilio iddyn nhw ers dros 50 mlynedd – gan weithio tuag…” Source: RevenueBase Database · checked Sep 19, 2026
20	National Wildlife Federation	Indirect evidence	Reston, VA, United StatesHQ checked Sep 19, 2026	201-500	585 contacts →
	Indirect evidence “As America's largest non-profit conservation organization, the National Wildlife Federation works closely with those who span the social and political spectrum, but who are…” Source: RevenueBase Database · checked Sep 19, 2026
21	Fauna & Flora	Indirect evidence	Cambridge, United KingdomHQ checked Sep 19, 2026	501-1,000	576 contacts →
	Indirect evidence “Fauna & Flora's work spans across the globe, with over 100 projects in more than 40 countries.” Source: RevenueBase Database · checked Sep 19, 2026
22	Mass Audubon	Indirect evidence	Lincoln, MA, United StatesHQ checked Sep 19, 2026	201-500	554 contacts →
	Indirect evidence “Mass Audubon is the largest nature-based conservation organization in New England.” Source: RevenueBase Database · checked Sep 19, 2026
23	U.S. Green Building Council	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	201-500	553 contacts →
	Indirect evidence “The U.S.” Source: RevenueBase Database · checked Sep 19, 2026
24	Trust For Public Land	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	201-500	531 contacts →
	Partial evidence “Trust for Public Land (TPL) is a national nonprofit that works to connect everyone to the benefits and joys of the outdoors.” Source: RevenueBase Database · checked Sep 19, 2026
25	Biotope	Indirect evidence	Mèze, FranceHQ checked Sep 19, 2026	201-500	517 contacts →
	Indirect evidence “Fondée en 1993 par des passionnés de nature engagés, Biotope s’est imposée au fil des années comme précurseur et leader mondial de l’ingénierie environnementale et de la…” 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: environmental 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 environmental nonprofits.
Partial evidence: Its own public description names part of environmental nonprofits, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental 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 23,163 environmental nonprofits worldwide

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Environmental nonprofits worldwide at a glance

As of Sep 19, 2026

26.7%Verified-email coverage

9.7Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

15,712

11-50

5,584

51-200

1,248

201-500

315

501-1,000

101

1,001-5,000

5,001-10,000

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 environmental 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 environmental nonprofits are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “environmental 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 environmental 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 environmental 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, 59,812 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.

Environmental nonprofits by location

86 lists · largest first

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

Countries

Cities

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 environmental 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 environmental nonprofits are there worldwide?

RevenueBase identified 23,163 environmental 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?

The Nature Conservancy, headquartered in Arlington, tops this list with the largest team on record.

Which country has the most environmental nonprofits?

The United States leads with 5,243 companies, followed by India (1,394) and Brazil (1,191). Every environmental nonprofits list by country and city is linked on this page.

Which city has the most environmental nonprofits?

London leads with 356 headquartered companies, followed by Paris (222) and New York (195).

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 59,812 verified decision-maker contacts tracked across these 23,163 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.