Company lists · Data refreshed September 2026

Top 25 Environmental research and advocacy organizations worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 8,958 companies tracked

RevenueBase identified 8,958 company matches for environmental research and advocacy organizations worldwide as of September 2026 and tracks 115,485 professional contacts across them, including 33,691 with verified work emails. The United States is the largest market and Washington the largest hub.

This list covers company matches for environmental research and advocacy organizations worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 19, 2026. Country and city lists for environmental research and advocacy organizations follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 19, 2026 How this list was built

8,958Companies

115,485Contacts tracked

33,691Verified emails

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The 25 largest environmental research and advocacy organizations worldwide

Ranked by team size

Top 25 of 8,958 company matches for environmental research and advocacy organizations worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 19, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	The Nature Conservancy	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	5,001-10,000	6,526 contacts →
	Exact match “Air, water, food, shelter, income: nature sustains every aspect of our lives.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
2	Greenpeace	Exact match	Amsterdam, NetherlandsHQ recorded Sep 19, 2026	n/a	2,945 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
3	IUCN	Exact match	Gland, SwitzerlandHQ recorded Sep 19, 2026	501-1,000	1,965 contacts →
	Exact match “IUCN, the International Union for Conservation of Nature, helps the world find pragmatic solutions to our most pressing environment and development challenges.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
4	Conservation International	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	501-1,000	1,560 contacts →
	Exact match “Since 1987, Conservation International has worked to spotlight and secure the critical benefits that nature provides to humanity.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
5	World Resources Institute	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,359 contacts →
	Exact match “WRI works to improve people’s lives, protect and restore nature and stabilize the climate.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
6	Environmental Defense Fund	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	1,001-5,000	1,352 contacts →
	Exact match “We are Environmental Defense Fund, a leading environmental nonprofit focused on stabilizing the climate while helping build strong and healthy communities.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
7	Sierra Club	Exact match	Oakland, CA, United StatesHQ recorded Sep 19, 2026	501-1,000	1,069 contacts →
	Exact match “At the Sierra Club, we believe in the power of togetherness.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
8	Natural Resources Defense Council Nrdc	Exact match	New York, NY, United StatesHQ recorded Sep 19, 2026	501-1,000	942 contacts →
	Exact match “NRDC is the nation's most effective environmental action organization.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
9	ISPRA	Exact match	Rome, ItalyHQ recorded Sep 19, 2026	1,001-5,000	811 contacts →
	Exact match “ISPRA è l'Istituto Superiore per la Protezione e la Ricerca Ambientale, ente pubblico di ricerca italiano dedicato alla protezione dell'ambiente.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
10	Helmholtz Centre For Environmental Research UFZ	Exact match	Leipzig, GermanyHQ recorded Sep 19, 2026	1,001-5,000	762 contacts →
	Exact match “The Helmholtz Centre for Environmental Research - UFZ was established in 1991 and has more than 1,100 employees in Leipzig, Halle/S.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
11	Oxfam Novib	Exact match	The Hague, NetherlandsHQ recorded Sep 19, 2026	201-500	708 contacts →
	Exact match “Wij strijden voor gelijkheid en we staan achter de mensen die opstaan voor gelijkheid.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
12	Earthjustice	Exact match	San Francisco, United StatesHQ recorded Sep 19, 2026	501-1,000	672 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
13	Centre For Alternative Technology	Exact match	Machynlleth, United KingdomHQ recorded Sep 19, 2026	n/a	618 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
14	PETA	Exact match	Norfolk, VA, United StatesHQ recorded Sep 19, 2026	201-500	592 contacts →
	Exact match “People for the Ethical Treatment of Animals (PETA) entities have more than 10.4 million members and supporters globally, and PETA U.S.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
15	Mass Audubon	Exact match	Lincoln, MA, United StatesHQ recorded Sep 19, 2026	201-500	554 contacts →
	Exact match “Mass Audubon is the largest nature-based conservation organization in New England.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
16	Biotope	Exact match	Mèze, FranceHQ recorded Sep 19, 2026	201-500	517 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
17	IVL Swedish Environmental Research Institute	Exact match	Stockholm, SwedenHQ recorded Sep 19, 2026	201-500	492 contacts →
	Exact match “IVL Swedish Environmental Research Institute is an independent, non-profit research organisation owned by a foundation established by the Swedish government and industry.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
18	SEI Stockholm Environment Institute	Exact match	Stockholm, SwedenHQ recorded Sep 19, 2026	201-500	462 contacts →
	Exact match “Stockholm Environment Institute – bridging science, policy and practice We are an international non-profit research institute that tackles climate, environment and sustainable…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
19	Foundation For Ecological Security FES	Exact match	Anand, IndiaHQ recorded Sep 19, 2026	201-500	461 contacts →
	Exact match “We work towards the ecological restoration and conservation of land and water resources, in conserving the uplands and other eco-fragile, degraded and marginalised zones of the…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
20	Council On Energy, Environment And Water Ceew	Exact match	New Delhi, IndiaHQ recorded Sep 19, 2026	201-500	435 contacts →
	Exact match “The Council on Energy, Environment and Water (CEEW), a homegrown institution with headquarters in New Delhi, is among the world’s leading climate think tanks.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
21	Western Ecosystems Technology, Inc. West	Exact match	Cheyenne, WY, United StatesHQ recorded Sep 19, 2026	201-500	408 contacts →
	Exact match “WEST provides environmental and statistical consulting services and contract research nationally and internationally to industry, government, and private organizations.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
22	Oceana	Exact match	United StatesHQ recorded Sep 19, 2026	201-500	398 contacts →
	Exact match “Oceana is the largest international advocacy organization dedicated solely to ocean conservation.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
23	National Environmental Engineering Research Institute Neeri	Exact match	Nagpur, IndiaHQ recorded Sep 19, 2026	201-500	369 contacts →
	Exact match “National Environmental Engineering Research Institute (NEERI), a constituent laboratory of CSIR endeavours to provide Leadership in environmental science and engineering for…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
24	RARE	Exact match	Arlington, VA, United StatesHQ recorded Sep 19, 2026	51-200	368 contacts →
	Exact match “Rare is a global leader in driving social change for people and nature.” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase
25	Clean Water Action	Exact match	Washington, DC, United StatesHQ recorded Sep 19, 2026	51-200	366 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 19, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “environmental research and advocacy organizations”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 8,958 environmental research and advocacy organizations worldwide

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Environmental research and advocacy organizations worldwide at a glance

As of Sep 19, 2026

29.2%Verified-email coverage

12.9Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

5,521

11-50

2,487

51-200

631

201-500

169

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for environmental research and advocacy organizations are linked below.
What qualifies: Company records worldwide whose business descriptions match “environmental research and advocacy organizations” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 33,691 professional contacts with verified work emails across the full matched dataset. 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.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Environmental research and advocacy organizations by location

41 lists · largest first

Every Environmental research and 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “environmental research and advocacy organizations”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental research and advocacy organizations are there worldwide?

RevenueBase identified 8,958 company matches for environmental research and advocacy organizations worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

The Nature Conservancy tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most environmental research and advocacy organizations?

The United States leads with 1,865 companies, followed by India (629) and France (469). Every environmental research and advocacy organizations list by country and city is linked on this page.

Which city has the most environmental research and advocacy organizations?

Washington leads with 118 company records, followed by London (100) and Paris (95).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 33,691 professional contacts with verified work emails tracked across these 8,958 companies; direct dials are available where recorded.

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 SmartSearch, 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.