Company lists · Data refreshed November 2026

Top 25 Climate action groups based in the United States

RevenueBase identified 448 company matches for climate action groups associated with the United States as of November 2026 and tracks 9,424 professional contacts across them, including 3,309 with verified work emails. Washington is the largest hub.

This list covers company matches for climate action groups associated with the United States, 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 November 6, 2026.

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 Nov 6, 2026 How this list was built
448Companies
9,424Contacts tracked
3,309Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest climate action groups based in the United States

Ranked by team size
Top 25 of 448 company matches for climate action groups based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchOakland, CA, United StatesHQ recorded Nov 6, 2026501-1,0001,156 contacts →

Exact match

“At the Sierra Club, we believe in the power of togetherness.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2Exact matchArlington, VA, United StatesHQ recorded Nov 6, 202651-200396 contacts →

Exact match

“Rare is a global leader in driving social change for people and nature.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3Exact matchWinooski, DC, United StatesHQ recorded Nov 6, 2026201-500344 contacts →

Exact match

“For 40 years, VEIC has helped energy leaders nationwide meet their clean energy goals.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4Exact matchWashington, DC, United StatesHQ recorded Nov 6, 2026n/a201 contacts →

Exact match

“Sunrise is a movement of young people uniting to stop the climate crisis.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5Exact matchSanta Cruz, CA, United StatesHQ recorded Nov 6, 202651-200152 contacts →

Exact match

“Ecology Action is an award-winning California 501(c)(3) non-profit that’s been inspiring sustainable community actions since 1970.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6Exact matchMadison, WI, United StatesHQ recorded Nov 6, 202651-200151 contacts →

Exact match

“We're a nonprofit headquartered in Madison, WI with an office in Chicago and remote staff across the U.S.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7Exact matchWashington, DC, United StatesHQ recorded Nov 6, 202611-50121 contacts →

Exact match

“EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8Exact matchWashington, DC, United StatesHQ recorded Nov 6, 202651-200102 contacts →

Exact match

“Founded in 1971, Greenpeace began when a small group of activists sailed from Vancouver to protest nuclear testing at Amchitka, Alaska.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9Exact matchDenver, CO, United StatesHQ recorded Nov 6, 202651-20091 contacts →

Exact match

“Environment America has one mission: to protect the natural world.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10Exact matchNew Haven, NY, United StatesHQ recorded Nov 6, 202611-5082 contacts →

Exact match

“Save the Sound leads environmental action across Connecticut, Westchester, NYC, and Long Island.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11Exact matchRockport, MA, United StatesHQ recorded Nov 6, 202611-5075 contacts →

Exact match

“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.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12Exact matchSan Francisco, CA, United StatesHQ recorded Nov 6, 202651-20073 contacts →

Exact match

“Pacific Environment confronts our most urgent environmental issues by connecting local and global movements, catalyzing policy change, and inspiring action for the benefit of…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13Exact matchSt. Paul, MN, United StatesHQ recorded Nov 6, 202611-5072 contacts →

Exact match

“Project Drawdown is the world’s leading guide to science-based climate solutions.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14Exact matchBurlington, VT, United StatesHQ recorded Nov 6, 2026n/a71 contacts →

Exact match

“Run On Climate’s mission is to build the climate movement by empowering those devoted to climate justice with the skills and resources they need to move their community off of…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15Exact matchWashington, DC, United StatesHQ recorded Nov 6, 202651-20069 contacts →

Exact match

“The Center for Climate and Energy Solutions (C2ES) is an independent, nonpartisan, nonprofit organization working to forge practical solutions to climate change.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16Exact matchSeattle, WA, United StatesHQ recorded Nov 6, 202611-5064 contacts →

Exact match

“Climate Solutions mission is to accelerate practical and profitable solutions to global warming by galvanizing leadership, growing investment and bridging divides.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17Exact matchIrvine, CA, United StatesHQ recorded Nov 6, 202611-5063 contacts →

Exact match

“Sequoia Climate Foundation believes in a world powered by clean energy, where all people are protected by policies that have averted the worst effects of climate change.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18Exact matchPhiladelphia, PA, United StatesHQ recorded Nov 6, 202611-5063 contacts →

Exact match

“The Clean Air Council is a member-supported, nonprofit environmental organization dedicated to protecting everyone's right to breathe clean air.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19Exact matchEugene, OR, United StatesHQ recorded Nov 6, 202611-5063 contacts →

Exact match

“Our Children’s Trust is a 501(c)(3) non-profit organization that elevates the voice of youth and leads the federal, state, local, and international campaign to secure the legal…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20Exact matchNY, United StatesHQ recorded Nov 6, 202611-5063 contacts →

Exact match

“We Mean Business is a global nonprofit coalition working with the world’s most influential businesses to take action on climate change.#FossilToClean Together we catalyze business…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21Exact matchMiami, FL, United StatesHQ recorded Nov 6, 202611-5063 contacts →

Exact match

“The CLEO Institute is a women-led 501(c)(3) non-profit, non-partisan organization dedicated to educating and empowering communities to demand climate action, ensuring a safe…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22Exact matchPalo Alto, CA, United StatesHQ recorded Nov 6, 202611-5062 contacts →

Exact match

“Bringing people together to create local solutions for a healthy planet.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23Exact matchMontpelier, VT, United StatesHQ recorded Nov 6, 202651-20061 contacts →

Exact match

“ISC is an international, non-profit organization that works to support communities by creating, implementing, and scaling equitable climate change solutions for communities at the…”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24Exact matchOakland, CA, United StatesHQ recorded Nov 6, 202611-5059 contacts →

Exact match

“California Environmental Voters (EnviroVoters) exists to build the political power to solve the climate crisis, advance justice, and create a roadmap for global action.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25Exact matchCambridge, MA, United StatesHQ recorded Nov 6, 202611-5053 contacts →

Exact match

“Second Nature's mission is to accelerate climate action in, and through, higher education.”

Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

Showing 25 of 448 climate action groups based in the United States

See the full list, filter by size, metro and specialty, and access 3,309 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Climate action groups based in the United States at a glance

As of Nov 6, 2026
35.1%Verified-email coverage
21.0Average contacts per company
1-10Median size (employees)
8.9%Largest-city concentration · Washington
Nov 6, 2026Page data refreshed

Companies by employee count

1-10
270
11-50
127
51-200
38
201-500
6
501-1,000
4
1,001-5,000
2
10001+
1

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 448 companies.

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.
What qualifies
Company records associated with the United States whose business descriptions match “climate action groups” 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 3,309 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 November 6, 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.

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 “climate action groups”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many climate action groups are there based in the United States?

RevenueBase identified 448 company matches for climate action groups associated with the United States as of November 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?

Sierra Club tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most climate action groups?

Washington leads with 40 company records, followed by New York (38) and Los Angeles (19).

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 3,309 professional contacts with verified work emails tracked across these 448 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 November 6, 2026.

Ready to reach these companies? Verified emails and direct dials for all 448 climate action groups based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

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.