Company lists · Data refreshed September 2026

Top 25 Climate action consulting firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 2,539 companies tracked

RevenueBase identified 2,539 company matches for climate action consulting firms associated with the United States as of September 2026 and tracks 36,614 professional contacts across them, including 16,840 with verified work emails. New York is the largest hub.

This list covers company matches for climate action consulting firms 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 September 21, 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 Sep 21, 2026 How this list was built

2,539Companies

36,614Contacts tracked

16,840Verified emails

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The 25 largest climate action consulting firms based in the United States

Ranked by team size

Top 25 of 2,539 company matches for climate action consulting firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	APTIM	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,639 contacts →
	Exact match “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,629 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Montrose Environmental Group	Exact match	Little Rock, AR, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,529 contacts →
	Exact match “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Environmental Defense Fund	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,352 contacts →
	Exact match “We are Environmental Defense Fund, a leading environmental nonprofit focused on stabilizing the climate while helping build strong and healthy communities.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 21, 2026	n/a	1,145 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Verdantas	Exact match	Tampa, FL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,139 contacts →
	Exact match “At Verdantas, we blend engineering and environmental science together with advanced technology and world-renowned labs to create solutions with the big picture in mind.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Climatebase	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	n/a	759 contacts →
	Exact match “Climatebase is the community for climate & sustainability professionals, and the world's #1 platform for green jobs.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Resource Innovations	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 21, 2026	501-1,000	733 contacts →
	Exact match “Resource Innovations (RI) is an energy transformation firm.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Uniqus Consultech INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	501-1,000	675 contacts →
	Exact match “Uniqus Consultech is an AI and global tech-enabled consulting company that specializes in Accounting & Reporting Consulting, Governance, Risk & Compliance, Sustainability &…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Agritecture	Exact match	New York, NY, United StatesHQ recorded Sep 21, 2026	n/a	627 contacts →
	Exact match “Agritecture is a global advisory firm specializing in climate-smart agriculture and controlled environment agriculture (CEA).” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Groundwater & Environmental Services, INC	Exact match	Wall Township, NJ, United StatesHQ recorded Sep 21, 2026	201-500	447 contacts →
	Exact match “We are Groundwater & Environmental Services, Inc, better known as GES.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Synergy Consulting, INC	Exact match	Washington, DC, United StatesHQ recorded Sep 21, 2026	51-200	434 contacts →
	Exact match “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	ROUX	Exact match	Islandia, NY, United StatesHQ recorded Sep 21, 2026	201-500	433 contacts →
	Exact match “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 21, 2026	201-500	383 contacts →
	Exact match “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 21, 2026	201-500	375 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 21, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	3degrees Group, INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	201-500	324 contacts →
	Exact match “3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 21, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 21, 2026	51-200	305 contacts →
	Exact match “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 21, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Climate Policy Initiative	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	51-200	288 contacts →
	Exact match “CPI is an analysis and advisory organization with deep expertise in finance and policy.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Ecology And Environment, INC	Exact match	Lancaster, NY, United StatesHQ recorded Sep 21, 2026	5,001-10,000	278 contacts →
	Exact match “E&E is now WSP USA.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Nova Group, GBC	Exact match	St. Louis Park, MN, United StatesHQ recorded Sep 21, 2026	201-500	264 contacts →
	Exact match “Nova Group, GBC is an international, multidisciplinary advising firm providing environmental, engineering and energy services throughout North America and around the globe.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	PSC Consulting	Exact match	Kirkland, WA, United StatesHQ recorded Sep 21, 2026	201-500	254 contacts →
	Exact match “We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Metiri Group	Exact match	Clovis, CA, United StatesHQ recorded Sep 21, 2026	n/a	233 contacts →
	Exact match “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “climate action consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 2,539 climate action consulting firms based in the United States

See the full list, filter by size, metro and specialty, and access 16,840 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Climate action consulting firms based in the United States at a glance

As of Sep 21, 2026

46.0%Verified-email coverage

14.4Average contacts per company

1-10Median size (employees)

7.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,865

11-50

511

51-200

111

201-500

501-1,000

1,001-5,000

5,001-10,000

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 2,539 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 consulting firms” 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 16,840 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 September 21, 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.

Climate action consulting firms by metro

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 consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 2,539 company matches for climate action consulting firms associated with the United States as of September 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?

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

Which city has the most climate action consulting firms?

New York leads with 183 company records, followed by Washington (119) and Houston (72).

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 16,840 professional contacts with verified work emails tracked across these 2,539 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 September 21, 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 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.