Company lists · Data refreshed September 2026

Top 25 Climate change organizations based in Washington, United States

Name: Climate change organizations based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 122 companies tracked

RevenueBase identified 122 climate change organizations headquartered in Washington, United States as of September 2026 and tracks 4,564 professional contacts across them, including 861 with verified work emails. Washington is the largest hub.

This list covers climate change organizations headquartered in Washington, 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

122Companies

4,564Contacts tracked

861Verified emails

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The 25 largest climate change organizations based in Washington, United States

Ranked by team size

Top 25 of 122 climate change organizations based in Washington, 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 change 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	World Resources Institute	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1,001-5,000	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, 2026
2	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
3	VERRA	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
4	earthday.org	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	144 contacts →
	Indirect evidence “EARTHDAY.ORG’s mission is to diversify, educate and activate the environmental movement worldwide.” Source: RevenueBase Database · checked Sep 19, 2026
5	NDC Partnership	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	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, 2026
6	Greenpeace USA	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
7	The American Council For An Energy-Efficient Economy Aceee	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
8	Center For Climate And Energy Solutions C2es	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	67 contacts →
	Strong evidence “The Center for Climate and Energy Solutions (C2ES) is an independent, nonpartisan, nonprofit organization working to forge practical solutions to climate change.” Source: RevenueBase Database · checked Sep 19, 2026
9	Ecoamerica	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	53 contacts →
	Partial evidence “ecoAmerica grows the base of popular support for climate solutions in America with research-driven marketing, partnerships, and national programs that connect with Americans' core…” Source: RevenueBase Database · checked Sep 19, 2026
10	OIL Change International	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	47 contacts →
	Partial evidence “Oil Change International is a research, communication, and advocacy organization focused on exposing the true costs of fossil fuels and facilitating the coming transition towards…” Source: RevenueBase Database · checked Sep 19, 2026
11	Institute For Governance & Sustainable Development Igsd	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	47 contacts →
	Partial evidence “IGSD’s mission is to build resilience by accelerating fast climate mitigation actions to slow near-term warming and self-reinforcing climate feedbacks, avoid catastrophic climate…” Source: RevenueBase Database · checked Sep 19, 2026
12	Mighty Earth	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	44 contacts →
	Indirect evidence “Mighty Earth is a global environmental organization that works to make a lasting difference for the planet and its people with a focus on forests, sustainable agriculture, and…” Source: RevenueBase Database · checked Sep 19, 2026
13	Climate Interactive	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	42 contacts →
	Partial evidence “Climate Interactive creates and shares cutting-edge tools that drive effective and equitable climate action.” Source: RevenueBase Database · checked Sep 19, 2026
14	The Center For Climate And Security	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	37 contacts →
	Strong evidence “The Center for Climate and Security explores the national security risks of climate change.” Source: RevenueBase Database · checked Sep 19, 2026
15	Environmental And Energy Study Institute Eesi	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	36 contacts →
	Indirect evidence “The Environmental and Energy Study Institute (EESI) is a nonprofit organization established in 1984 by a bipartisan Congressional caucus to provide timely, credible information…” Source: RevenueBase Database · checked Sep 19, 2026
16	CCAP	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	35 contacts →
	Partial evidence “The Center for Clean Air Policy (CCAP) supports every step of climate action, from ambition to implementation.” Source: RevenueBase Database · checked Sep 19, 2026
17	Carbon180	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Partial evidence “A new breed of climate NGO on a mission to reverse two centuries of carbon emissions.” Source: RevenueBase Database · checked Sep 19, 2026
18	Evergreen Action	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	33 contacts →
	Partial evidence “We're advancing an all-out national mobilization to defeat the climate crisis and create millions of jobs in a just, thriving, and inclusive clean energy economy.” Source: RevenueBase Database · checked Sep 19, 2026
19	Silverlining	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	n/a	32 contacts →
	Partial evidence “SilverLining is a non-profit organization dedicated to ensuring that society has sufficient options to address near-term climate risk.” Source: RevenueBase Database · checked Sep 19, 2026
20	The Center For Climate Integrity	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	28 contacts →
	Partial evidence “The Center for Climate Integrity (CCI) empowers communities and elected officials with the knowledge and tools they need to hold oil and gas corporations accountable for decades…” Source: RevenueBase Database · checked Sep 19, 2026
21	U.S. Climate Alliance	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “The U.S.” Source: RevenueBase Database · checked Sep 19, 2026
22	Climate Leadership Council	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	23 contacts →
	Partial evidence “The Climate Leadership Council (the Council) is a nonprofit think tank dedicated to championing the most effective, fair, and lasting climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
23	Medical Society Consortium On Climate And Health	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	1-10	22 contacts →
	Strong evidence “Climate change is the greatest public health crisis of the 21st century.” Source: RevenueBase Database · checked Sep 19, 2026
24	KONU	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	20 contacts →
	Partial evidence “The support and space you need to face a changing world.” Source: RevenueBase Database · checked Sep 19, 2026
25	Ocean Visions	Indirect evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	11-50	20 contacts →
	Indirect evidence “Ocean Visions was created to develop and advance solutions to protect and restore the ocean.” 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 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 122 climate change organizations based in Washington, United States

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Climate change organizations based in Washington, United States at a glance

As of Sep 19, 2026

18.9%Verified-email coverage

37.4Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · Washington

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 122 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 Washington, 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 Washington 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, 861 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 in the United States

Climate change organizations in Washington122
Climate change organizations in New York120
Climate change organizations in San Francisco76
Climate change organizations in Boston45
Climate change organizations in Los Angeles40
Climate change organizations in Seattle36

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 Washington, United States?

RevenueBase identified 122 climate change organizations headquartered in Washington, 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 861 verified decision-maker contacts tracked across these 122 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.