Company lists · Data refreshed September 2026
Top 25 Climate change organizations based in the United States
RevenueBase identified 1,376 climate change organizations headquartered in the United States as of September 2026 and tracks 22,089 professional contacts across them, including 7,322 with verified work emails. Washington is the largest hub.
This list covers climate change organizations 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.
The 25 largest climate change organizations based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,359 contacts → | ||||
Partial evidence “WRI works to improve people’s lives, protect and restore nature and stabilize the climate.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,069 contacts → | ||||
Indirect evidence “At the Sierra Club, we believe in the power of togetherness.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 4 | 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, 2026Thanks. The Data Team will review it. | |||||
| 5 | 368 contacts → | ||||
Partial evidence “Rare is a global leader in driving social change for people and nature.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 6 | 288 contacts → | ||||
Indirect evidence “CPI is an analysis and advisory organization with deep expertise in finance and policy.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 224 contacts → | ||||
Partial 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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 222 contacts → | ||||
Partial evidence “Sunrise is a movement of young people uniting to stop the climate crisis.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 10 | 221 contacts → | ||||
Partial evidence “Founded in 2007, Verra is a global mission-driven nonprofit organization that develops and manages the leading standards for climate and sustainable development.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 11 | 205 contacts → | ||||
Partial evidence “ClimateWorks Foundation is a catalyst for accelerating climate progress, driving bold solutions that benefit people and the planet.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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, 2026Thanks. The Data Team will review it. | |||||
| 14 | 144 contacts → | ||||
Indirect evidence “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 15 | 140 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 16 | 127 contacts → | ||||
Partial evidence “SEI is an environmental nonprofit that builds leaders to accelerate climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 17 | 124 contacts → | ||||
Indirect evidence “The NDC Partnership brings together 270 members, including more than 140 countries, developed and developing, and more than 110 institutions to create and deliver on ambitious…” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 18 | 97 contacts → | ||||
Indirect 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, 2026Thanks. The Data Team will review it. | |||||
| 19 | 95 contacts → | ||||
Strong evidence “Protect Our Winters is a 501(c)(3) nonprofit that helps passionate outdoor people protect the places and experiences they love from climate change.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 20 | 93 contacts → | ||||
Strong 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, 2026Thanks. The Data Team will review it. | |||||
| 21 | 91 contacts → | ||||
Strong 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, 2026Thanks. The Data Team will review it. | |||||
| 22 | 91 contacts → | ||||
Partial evidence “The Women and Climate community provides a joyful and safe space for women and nonbinary professionals from around the world to learn and talk about climate.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 23 | 83 contacts → | ||||
Partial evidence “Jupiter is the trusted leader in climate risk analytics for organizations looking to strengthen their climate resilience.” Source: RevenueBase Database · checked Sep 19, 2026Thanks. The Data Team will review it. | |||||
| 24 | 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, 2026Thanks. The Data Team will review it. | |||||
| 25 | 82 contacts → | ||||
Strong 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, 2026Thanks. The Data Team will review it. | |||||
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 change 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 climate change organizations.
- Partial evidence
- Its own public description names part of climate change organizations, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name climate change 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 1,376 climate change organizations based in the United States
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Climate change organizations based in the United States at a glance
As of Sep 19, 2026Companies by employee count
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 1,376 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 change 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.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “climate change 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 climate change 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 climate change organizations, 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, 7,322 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 change organizations 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 change 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 climate change organizations are there based in the United States?
RevenueBase identified 1,376 climate change organizations 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?
World Resources Institute, headquartered in Washington, tops this list with the largest team on record.
Which city has the most climate change organizations?
Washington leads with 122 headquartered companies, followed by New York (120) and San Francisco (76).
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 7,322 verified decision-maker contacts tracked across these 1,376 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 change organizations by geography
- Climate change organizations based in Toronto, Canada
- Climate change organizations based in Vancouver, Canada
- Climate change organizations based in Boston, United States
- Climate change organizations based in Los Angeles, United States
- Climate change organizations based in New York, United States
- Climate change organizations based in San Francisco, United States
- Climate change organizations based in Seattle, United States
- Climate change organizations based in Washington, United States
- Climate change organizations based in Argentina
- Climate change organizations based in Australia
- Climate change organizations based in Austria
- Climate change organizations based in Belgium
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.
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- Climate change organizations based in Toronto, Canada
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