Company lists · Data refreshed September 2026

Top 25 Climate tech consulting firms worldwide

Name: Climate tech consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 18,056 companies tracked

RevenueBase identified 18,056 climate tech consulting firms worldwide as of September 2026 and tracks 350,705 professional contacts across them, including 131,039 with verified work emails. The United States is the largest market and London the largest hub.

This list covers climate tech consulting firms worldwide, 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 27, 2026. Country and city lists for climate tech consulting firms follow the table.

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 27, 2026 86% judged on-target in blind review

18,056Companies

350,705Contacts tracked

131,039Verified emails

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The 25 largest climate tech consulting firms worldwide

Ranked by team size

Top 25 of 18,056 climate tech consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to climate tech consulting firms: 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	Worley	Indirect evidence	Sydney, AustraliaHQ checked Sep 27, 2026	10001+	34,763 contacts →
	Indirect evidence “Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.” Source: RevenueBase Database · checked Sep 27, 2026
2	Arcadis	Indirect evidence	Amsterdam, NetherlandsHQ checked Sep 27, 2026	10001+	33,846 contacts →
	Indirect evidence “Arcadis is a leading global partner, delivering transformative projects with businesses, cities and industries.” Source: RevenueBase Database · checked Sep 27, 2026
3	Stantec	Indirect evidence	Edmonton, AB, CanadaHQ checked Sep 27, 2026	10001+	28,416 contacts →
	Indirect evidence “Stantec empowers clients, people, and communities to rise to the world’s greatest challenges at a time when the world faces more unprecedented concerns than ever before.” Source: RevenueBase Database · checked Sep 27, 2026
4	Engie Solutions France	Indirect evidence	La Garenne-colombes, FranceHQ checked Sep 27, 2026	10001+	12,011 contacts →
	Indirect evidence “Les activités Infrastructures Energétiques Locales d’ENGIE accompagnent les collectivités, les industries et le secteur du bâtiment sur la voie de la décarbonation.” Source: RevenueBase Database · checked Sep 27, 2026
5	Carrier Hvac	Partial evidence	United StatesHQ checked Sep 27, 2026	10001+	10,099 contacts →
	Partial evidence “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Source: RevenueBase Database · checked Sep 27, 2026
6	ERM	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	5,001-10,000	9,119 contacts →
	Indirect evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 27, 2026
7	Dalkia	Partial evidence	Saint-andré-lez-lille, FranceHQ checked Sep 27, 2026	10001+	8,427 contacts →
	Partial evidence “Dalkia : ensemble, relevons le défi climatique!” Source: RevenueBase Database · checked Sep 27, 2026
8	Johnson Matthey	Indirect evidence	London, ItalyHQ checked Sep 27, 2026	5,001-10,000	8,053 contacts →
	Indirect evidence “Johnson Matthey (JM) is a world leader in platinum group metals (PGMs).” Source: RevenueBase Database · checked Sep 27, 2026
9	SLR Consulting	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	3,848 contacts →
	Indirect evidence “SLR is a committed partner in our clients’ sustainability journeys.” Source: RevenueBase Database · checked Sep 27, 2026
10	Veolia UK	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	10001+	2,823 contacts →
	Indirect evidence “Veolia UK provides solutions for ecological transformation which means reconciling human progress with environmental protection.” Source: RevenueBase Database · checked Sep 27, 2026
11	APTIM	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,639 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 27, 2026
12	Mckinstry	Partial evidence	Seattle, WA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,213 contacts →
	Partial evidence “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Source: RevenueBase Database · checked Sep 27, 2026
13	Clearesult	Indirect evidence	Austin, TX, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,121 contacts →
	Indirect evidence “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Source: RevenueBase Database · checked Sep 27, 2026
14	Ricardo	Indirect evidence	West Sussex, United KingdomHQ checked Sep 27, 2026	1,001-5,000	2,104 contacts →
	Indirect evidence “Ricardo, a member of @WSP, is a global engineering company, specialising in complex propulsion, driveline and energy systems, delivering high integrity solutions for customers…” Source: RevenueBase Database · checked Sep 27, 2026
15	Baycurrent	Indirect evidence	港区, JapanHQ checked Sep 27, 2026	5,001-10,000	1,900 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
16	BBA Consultants	Indirect evidence	Mont-saint-hilaire, QC, CanadaHQ checked Sep 27, 2026	1,001-5,000	1,863 contacts →
	Indirect evidence “We help companies with their challenges and transformation by relying on our sharp business acumen, extensive practical experience and vast technological curiosity.” Source: RevenueBase Database · checked Sep 27, 2026
17	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,629 contacts →
	Partial evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Sep 27, 2026
18	Montrose Environmental Group	Indirect evidence	Little Rock, AR, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,529 contacts →
	Indirect evidence “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Source: RevenueBase Database · checked Sep 27, 2026
19	Vulcain Engineering Group	Partial evidence	Neuilly-sur-seine, FranceHQ checked Sep 27, 2026	5,001-10,000	1,496 contacts →
	Partial evidence “Vulcain Engineering Group is a multi-specialist engineering and consulting group serving industrial companies across the globe, focused on critical sectors: energy, health…” Source: RevenueBase Database · checked Sep 27, 2026
20	Ameresco	Indirect evidence	Framingham, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,383 contacts →
	Indirect evidence “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Source: RevenueBase Database · checked Sep 27, 2026
21	Fichtner	Indirect evidence	Stuttgart, GermanyHQ checked Sep 27, 2026	1,001-5,000	1,279 contacts →
	Indirect evidence “As a leading, independent engineering and consultancy enterprise active in the sectors of energy and infrastructure, Fichtner handles challenging projects in countries all over…” Source: RevenueBase Database · checked Sep 27, 2026
22	DGE Danmark	Indirect evidence	Højbjerg, DenmarkHQ checked Sep 27, 2026	n/a	1,176 contacts →
	Indirect evidence “Miljø er vores kernekompetence og vores ansvar.” Source: RevenueBase Database · checked Sep 27, 2026
23	Verdantas	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 27, 2026	1,001-5,000	1,139 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 27, 2026
24	Anthesis Group	Indirect evidence	London, United KingdomHQ checked Sep 27, 2026	1,001-5,000	894 contacts →
	Indirect evidence “Anthesis guides clients to sustainable performance.” Source: RevenueBase Database · checked Sep 27, 2026
25	Willdan	Partial evidence	Anaheim, CA, United StatesHQ checked Sep 27, 2026	1,001-5,000	851 contacts →
	Partial evidence “Willdan (NASDAQ: WLDN) provides professional consulting and technical services to utilities, public agencies and private industry throughout the United States.” Source: RevenueBase Database · checked Sep 27, 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 tech consulting firms. 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 tech consulting firms.
Partial evidence: Its own public description names part of climate tech consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate tech consulting firms. 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 18,056 climate tech consulting firms worldwide

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Climate tech consulting firms worldwide at a glance

As of Sep 27, 2026

37.4%Verified-email coverage

19.4Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · London

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

12,359

11-50

4,414

51-200

879

201-500

188

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 tech consulting firms, 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.
Coverage: Every country. Country and city lists for climate tech consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “climate tech consulting firms”. 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 tech consulting firms), 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 tech consulting firms, and records with no verified work email.
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, 131,039 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 27, 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 tech consulting firms by location

90 lists · largest first

Every Climate tech consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 tech consulting firms, 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 tech consulting firms are there worldwide?

RevenueBase identified 18,056 climate tech consulting firms worldwide 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?

Worley, headquartered in Sydney, tops this list with the largest team on record.

Which country has the most climate tech consulting firms?

The United States leads with 1,981 companies, followed by Brazil (1,204) and France (1,190). Every climate tech consulting firms list by country and city is linked on this page.

Which city has the most climate tech consulting firms?

London leads with 411 headquartered companies, followed by Paris (245) and Sao Paulo (222).

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 131,039 verified decision-maker contacts tracked across these 18,056 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 27, 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.