Company lists · Data refreshed September 2026

Top 25 Environmental advocacy organizations worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 3,883 companies tracked

RevenueBase identified 3,883 environmental advocacy organizations worldwide as of September 2026 and tracks 48,230 professional contacts across them, including 14,905 with verified work emails. The United States is the largest market and Washington the largest hub.

This list covers environmental advocacy organizations 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 advocacy organizations 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

3,883Companies

48,230Contacts tracked

14,905Verified emails

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The 25 largest environmental advocacy organizations worldwide

Ranked by team size

Top 25 of 3,883 environmental advocacy organizations worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental advocacy organizations: 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	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
2	Environmental Defense Fund	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,352 contacts →
	Partial 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
3	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
4	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
5	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
6	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
7	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
8	Oceana	Partial evidence	United StatesHQ checked Sep 19, 2026	201-500	398 contacts →
	Partial evidence “Oceana is the largest international advocacy organization dedicated solely to ocean conservation.” Source: RevenueBase Database · checked Sep 19, 2026
9	RARE	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	51-200	368 contacts →
	Indirect evidence “Rare is a global leader in driving social change for people and nature.” Source: RevenueBase Database · checked Sep 19, 2026
10	Clean Water Action	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	366 contacts →
	Partial evidence “Since our founding during the campaign to pass the landmark Clean Water Act in 1972, Clean Water Action has worked to win strong health and environmental protections by bringing…” Source: RevenueBase Database · checked Sep 19, 2026
11	Clientearth	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	324 contacts →
	Indirect evidence “We are a non-profit using the power of the law to bring about end-to-end systemic change: informing, implementing and enforcing the law, drafting and advising decision-makers on…” Source: RevenueBase Database · checked Sep 19, 2026
12	Chesapeake BAY Foundation	Indirect evidence	Annapolis, MD, United StatesHQ checked Sep 19, 2026	51-200	312 contacts →
	Indirect evidence “The Chesapeake Bay Foundation (CBF) fights for bold and creative solutions to the pollution that plagues the Bay and its tributaries.” Source: RevenueBase Database · checked Sep 19, 2026
13	Eden Project	Indirect evidence	Par, FranceHQ checked Sep 19, 2026	201-500	309 contacts →
	Indirect evidence “We demonstrate and inspire positive action for the planet Healthy planet, healthy people.” Source: RevenueBase Database · checked Sep 19, 2026
14	National Parks Conservation Association	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	303 contacts →
	Indirect evidence “Named a USA Top Workplace in 2023** For a century, National Parks Conservation Association has been a powerful independent voice working to strengthen and protect America's…” Source: RevenueBase Database · checked Sep 19, 2026
15	Earth5r	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	n/a	299 contacts →
	Partial evidence “Earth5R is a UNESCO-recognized global environmental organization driving the shift towards a green economy.” Source: RevenueBase Database · checked Sep 19, 2026
16	Union Of Concerned Scientists	Indirect evidence	Cambridge, MA, United StatesHQ checked Sep 19, 2026	201-500	254 contacts →
	Indirect evidence “Our mission is to use rigorous, independent science to solve our planet's most pressing problems.” Source: RevenueBase Database · checked Sep 19, 2026
17	Ashoka Trust For Research In Ecology And The Environment	Partial evidence	Bengaluru, IndiaHQ checked Sep 19, 2026	51-200	253 contacts →
	Partial evidence “ATREE's mission is to promote socially just environmental conservation and sustainable development by generating rigorous interdisciplinary knowledge that engages actively with…” Source: RevenueBase Database · checked Sep 19, 2026
18	Naturskyddsföreningen Ssnc	Partial evidence	Stockholm, SwedenHQ checked Sep 19, 2026	51-200	246 contacts →
	Partial evidence “The Swedish Society for Nature Conservation (SSNC) is an environmental organization with power to bring about change.” Source: RevenueBase Database · checked Sep 19, 2026
19	Ceres, INC	Partial evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	241 contacts →
	Partial evidence “Ceres is a nonprofit advocacy organization working to accelerate the transition to a cleaner, more just, and resilient world.” Source: RevenueBase Database · checked Sep 19, 2026
20	Seaside Sustainability	Partial evidence	Gloucester, MA, United StatesHQ checked Sep 19, 2026	51-200	240 contacts →
	Partial evidence “Seaside Sustainability is a nationally recognized, award-winning 501(c)3 charitable organization dedicated to community engagement, education and environmental conservation.” Source: RevenueBase Database · checked Sep 19, 2026
21	Yayasan Konservasi Alam Nusantara	Indirect evidence	Jakarta Selatan, IndonesiaHQ checked Sep 19, 2026	51-200	230 contacts →
	Indirect evidence “Yayasan Konservasi Alam Nusantara (YKAN) adalah organisasi nirlaba berbasis ilmiah yang hadir di Indonesia sejak 2014.” Source: RevenueBase Database · checked Sep 19, 2026
22	Centre For Science And Environment, NEW Delhi	Strong evidence	New Delhi, IndiaHQ checked Sep 19, 2026	51-200	222 contacts →
	Strong evidence “The Centre for Science and Environment (CSE) is a public interest research and advocacy organisation based in New Delhi.” Source: RevenueBase Database · checked Sep 19, 2026
23	League Of Conservation Voters	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	218 contacts →
	Indirect evidence “LCV believes our earth is worth fighting for because everyone has a right to clean air, water, and a safe, healthy community.” Source: RevenueBase Database · checked Sep 19, 2026
24	WWF Colombia	Partial evidence	Cali, ColombiaHQ checked Sep 19, 2026	51-200	217 contacts →
	Partial evidence “WWF's Mission Statement To stop the degradation of the planet's natural environment and to build a future in which humans live in harmony with nature, by- conserving the world's…” Source: RevenueBase Database · checked Sep 19, 2026
25	Milieudefensie	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 19, 2026	51-200	210 contacts →
	Indirect evidence “Onze missie?” 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 advocacy organizations. 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 advocacy organizations.
Partial evidence: Its own public description names part of environmental advocacy organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental advocacy organizations. 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 3,883 environmental advocacy organizations worldwide

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Environmental advocacy organizations worldwide at a glance

As of Sep 19, 2026

30.9%Verified-email coverage

12.4Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,431

11-50

1,047

51-200

275

201-500

501-1,000

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 advocacy organizations, 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 advocacy organizations are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “environmental advocacy organizations”. 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 advocacy organizations), 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 advocacy organizations, 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, 14,905 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 advocacy organizations by location

17 lists · largest first

Every Environmental advocacy organizations 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 advocacy organizations, 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 advocacy organizations are there worldwide?

RevenueBase identified 3,883 environmental advocacy organizations 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?

Greenpeace, headquartered in Amsterdam, tops this list with the largest team on record.

Which country has the most environmental advocacy organizations?

The United States leads with 1,030 companies, followed by India (249) and France (182). Every environmental advocacy organizations list by country and city is linked on this page.

Which city has the most environmental advocacy organizations?

Washington leads with 76 headquartered companies, followed by London (48) and Paris (41).

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 14,905 verified decision-maker contacts tracked across these 3,883 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.