Company lists · Data refreshed September 2026

Top 25 Climate action groups based in the United States

Name: Climate action groups based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 835 companies tracked

RevenueBase identified 835 climate action groups headquartered in the United States as of September 2026 and tracks 17,189 professional contacts across them, including 5,614 with verified work emails. New York is the largest hub.

This list covers climate action groups headquartered in the United States, 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.

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

835Companies

17,189Contacts tracked

5,614Verified emails

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The 25 largest climate action groups based in the United States

Ranked by team size

Top 25 of 835 climate action groups based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to climate action groups: 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	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
2	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
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	Climatebase	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	n/a	759 contacts →
	Partial evidence “Climatebase is the community for climate & sustainability professionals, and the world's #1 platform for green jobs.” Source: RevenueBase Database · checked Sep 19, 2026
5	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
6	Climate Policy Initiative	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	51-200	288 contacts →
	Indirect evidence “CPI is an analysis and advisory organization with deep expertise in finance and policy.” Source: RevenueBase Database · checked Sep 19, 2026
7	Ceres, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	51-200	241 contacts →
	Indirect 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
8	The Conservation Fund	Strong evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	224 contacts →
	Strong evidence “We are in the business of conservation, creating innovative solutions that drive nature-based action for climate protection, sustainable economies and vibrant communities.” Source: RevenueBase Database · checked Sep 19, 2026
9	Sunrise Movement	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	222 contacts →
	Partial evidence “Sunrise is a movement of young people uniting to stop the climate crisis.” Source: RevenueBase Database · checked Sep 19, 2026
10	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
11	Woodwell Climate Research Center	Partial evidence	Falmouth, MA, United StatesHQ checked Sep 19, 2026	51-200	156 contacts →
	Partial evidence “Woodwell Climate Research Center conducts science for solutions at the nexus of climate, people, and nature-solutions that are urgently needed to propel us toward a more…” Source: RevenueBase Database · checked Sep 19, 2026
12	Slipstream	Indirect evidence	Madison, WI, United StatesHQ checked Sep 19, 2026	51-200	146 contacts →
	Indirect 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
13	earthday.org	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	144 contacts →
	Partial evidence “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
14	Ecology Action	Partial evidence	Santa Cruz, CA, United StatesHQ checked Sep 19, 2026	51-200	140 contacts →
	Partial evidence “Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.” Source: RevenueBase Database · checked Sep 19, 2026
15	SEI	Partial evidence	San Rafael, CA, United StatesHQ checked Sep 19, 2026	51-200	127 contacts →
	Partial evidence “SEI is an environmental nonprofit that builds leaders to accelerate climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
16	The Public Interest Network	Indirect evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	201-500	114 contacts →
	Indirect evidence “The Public Interest Network runs organizations committed to our vision of a better world, a set of core values, and a strategic approach to getting things done.” Source: RevenueBase Database · checked Sep 19, 2026
17	Greenpeace USA	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	97 contacts →
	Partial evidence “Founded in 1971, Greenpeace began when a small group of activists sailed from Vancouver to protest nuclear testing at Amchitka, Alaska.” Source: RevenueBase Database · checked Sep 19, 2026
18	Environment America	Partial evidence	Denver, CO, United StatesHQ checked Sep 19, 2026	51-200	93 contacts →
	Partial evidence “Every day, we see more heartbreaking evidence of the damage being done to our planet: climate change, plastic pollution, wildlife disappearing forever.” Source: RevenueBase Database · checked Sep 19, 2026
19	We ARE Rally	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	51-200	91 contacts →
	Indirect evidence “RALLY is an advocacy agency.” Source: RevenueBase Database · checked Sep 19, 2026
20	The American Council For An Energy-Efficient Economy Aceee	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	91 contacts →
	Partial evidence “The American Council for an Energy-Efficient Economy a nonprofit research organization, develops policies to reduce energy waste and combat climate change.” Source: RevenueBase Database · checked Sep 19, 2026
21	Bridging The GAP	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	11-50	83 contacts →
	Indirect evidence “Bridging The Gap brings people together to protect and restore the web of life on Earth and foster inclusive, thriving communities through environmental education, innovation, and…” Source: RevenueBase Database · checked Sep 19, 2026
22	Western Resource Advocates	Partial evidence	Boulder, CO, United StatesHQ checked Sep 19, 2026	51-200	82 contacts →
	Partial evidence “Western Resource Advocates fights climate change and its impacts to sustain the environment, economy, and people of the West.” Source: RevenueBase Database · checked Sep 19, 2026
23	Save The Sound	Partial evidence	New Haven, CT, United StatesHQ checked Sep 19, 2026	11-50	74 contacts →
	Partial evidence “Save the Sound leads environmental action across Connecticut, Westchester, NYC, and Long Island.” Source: RevenueBase Database · checked Sep 19, 2026
24	ENE	Indirect evidence	Rockport, ME, United StatesHQ checked Sep 19, 2026	11-50	73 contacts →
	Indirect evidence “ENE was founded in Rockport, ME in and has grown rapidly to 16 professional staff in offices in 5 different states/provinces and two countries.” Source: RevenueBase Database · checked Sep 19, 2026
25	stand.earth	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	11-50	71 contacts →
	Indirect evidence “Stand.earth challenges corporations and governments to treat people and the environment with respect, because our lives depend on it.” 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: climate action groups. 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 climate action groups.
Partial evidence: Its own public description names part of climate action groups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate action groups. 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 835 climate action groups based in the United States

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Climate action groups based in the United States at a glance

As of Sep 19, 2026

32.7%Verified-email coverage

20.6Average contacts per company

1-10Median size (employees)

8.1%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

528

11-50

218

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 835 companies.

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 climate action groups, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “climate action groups”. 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 climate action groups), 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 climate action groups, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 5,614 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.

Climate action groups by metro

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 climate action groups, 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 climate action groups are there based in the United States?

RevenueBase identified 835 climate action groups headquartered in the United States 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?

Environmental Defense Fund, headquartered in New York, tops this list with the largest team on record.

Which city has the most climate action groups?

New York leads with 68 headquartered companies, followed by Washington (68) and San Francisco (32).

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 5,614 verified decision-maker contacts tracked across these 835 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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Climate action groups by geography

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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.