Company lists · Data refreshed September 2026

Top 25 Climate adaptation organizations based in the United States

Name: Climate adaptation organizations 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 779 companies tracked

RevenueBase identified 779 climate adaptation organizations headquartered in the United States as of September 2026 and tracks 11,010 professional contacts across them, including 3,919 with verified work emails. New York is the largest hub.

This list covers climate adaptation 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.

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

779Companies

11,010Contacts tracked

3,919Verified emails

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The 25 largest climate adaptation organizations based in the United States

Ranked by team size

Top 25 of 779 climate adaptation organizations 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 adaptation 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	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	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
3	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
4	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
5	The Conservation Fund	Partial evidence	Arlington, VA, United StatesHQ checked Sep 19, 2026	201-500	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, 2026
6	Climateworks Foundation	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	201-500	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, 2026
7	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
8	Ecology Action	Indirect evidence	Santa Cruz, CA, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
9	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
10	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
11	Protect OUR Winters	Partial evidence	Boulder, CO, United StatesHQ checked Sep 19, 2026	11-50	95 contacts →
	Partial 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, 2026
12	The Water Institute	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 19, 2026	51-200	92 contacts →
	Indirect evidence “The Water Institute is an independent, non-profit, applied research institution advancing science and developing integrated methods to solve complex environmental and societal…” Source: RevenueBase Database · checked Sep 19, 2026
13	Jupiter Intelligence	Partial evidence	San Mateo, CA, United StatesHQ checked Sep 19, 2026	51-200	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, 2026
14	Island Institute	Partial evidence	Rockland, ME, United StatesHQ checked Sep 19, 2026	11-50	77 contacts →
	Partial evidence “We boldly navigate climate and economic change with island and coastal communities to expand opportunities and deliver solutions.” Source: RevenueBase Database · checked Sep 19, 2026
15	RUN On Climate	Partial evidence	Burlington, VT, United StatesHQ checked Sep 19, 2026	n/a	70 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
16	Forterra NW	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	11-50	68 contacts →
	Partial evidence “OUR MISSION Forterra innovates and scales land-based solutions to address the climate crisis and support equitable, green, and prosperous communities.” Source: RevenueBase Database · checked Sep 19, 2026
17	Center For Climate And Energy Solutions C2es	Partial evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	51-200	67 contacts →
	Partial 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
18	Project Drawdown	Partial evidence	St Paul, MN, United StatesHQ checked Sep 19, 2026	11-50	67 contacts →
	Partial evidence “Project Drawdown is the world’s leading guide to science-based climate solutions.” Source: RevenueBase Database · checked Sep 19, 2026
19	Trellis Group	Partial evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	51-200	67 contacts →
	Partial evidence “Trellis Group, formerly GreenBiz Group, empowers professional communities to confront the climate crisis while building a regenerative, prosperous and just economy that supports…” Source: RevenueBase Database · checked Sep 19, 2026
20	The Cleo Institute	Partial evidence	Miami, FL, United StatesHQ checked Sep 19, 2026	11-50	67 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 19, 2026
21	Sequoia Climate Foundation	Partial evidence	Irvine, CA, United StatesHQ checked Sep 19, 2026	11-50	63 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 19, 2026
22	Southface Institute	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	11-50	60 contacts →
	Indirect evidence “Founded 1978, Southface Institute is a national nonprofit focused on sustainability and building science.” Source: RevenueBase Database · checked Sep 19, 2026
23	Coho, An ERM Group Company	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 19, 2026	51-200	59 contacts →
	Partial evidence “Coho, an ERM Group company, is a global climate adviser dedicated to helping clients navigate complexity and take ambitious steps on their climate journey.” Source: RevenueBase Database · checked Sep 19, 2026
24	ANDES	Partial evidence	Alameda, CA, United StatesHQ checked Sep 19, 2026	11-50	58 contacts →
	Partial evidence “Andes empowers biology to enable positive action against climate change.” Source: RevenueBase Database · checked Sep 19, 2026
25	We Mean Business Coalition	Partial evidence	NY, United StatesHQ checked Sep 19, 2026	11-50	57 contacts →
	Partial evidence “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…” 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 adaptation 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 adaptation organizations.
Partial evidence: Its own public description names part of climate adaptation organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate adaptation 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 779 climate adaptation organizations based in the United States

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Climate adaptation organizations based in the United States at a glance

As of Sep 19, 2026

35.6%Verified-email coverage

14.1Average contacts per company

1-10Median size (employees)

8.0%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

543

11-50

181

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 779 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 adaptation 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 adaptation 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 adaptation 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 adaptation 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, 3,919 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 adaptation 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 adaptation 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 adaptation organizations are there based in the United States?

RevenueBase identified 779 climate adaptation 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?

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

Which city has the most climate adaptation organizations?

New York leads with 62 headquartered companies, followed by Washington (57) and San Francisco (31).

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 3,919 verified decision-maker contacts tracked across these 779 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.