Company lists · Data refreshed September 2026

Top 25 Sustainability consulting services based in Chicago, United States

Name: Sustainability consulting services based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 89 companies tracked

RevenueBase identified 89 sustainability consulting services headquartered in Chicago, United States as of September 2026 and tracks 827 professional contacts across them, including 285 with verified work emails. New York is the largest hub.

This list covers sustainability consulting services headquartered in Chicago, 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 22, 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 22, 2026 86% judged on-target in blind review

89Companies

827Contacts tracked

285Verified emails

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The 25 largest sustainability consulting services based in Chicago, United States

Ranked by team size

Top 25 of 89 sustainability consulting services based in Chicago, United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainability consulting services: 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	SUMAC	Strong evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	51-200	183 contacts →
	Strong evidence “SUMAC is an architecture, engineering, and consulting firm that promotes sustainability as the key element to increasing the profitability of our clients and partners.” Source: RevenueBase Database · checked Sep 22, 2026
2	WRD Environmental	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	64 contacts →
	Partial evidence “WRD Environmental helps organizations committed to sustainability realize their vision.” Source: RevenueBase Database · checked Sep 22, 2026
3	Fitzgerald	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	56 contacts →
	Partial evidence “With roots dating back more than 100 years, FitzGerald is a national architecture, interior design, and sustainability firm committed to the creation of exemplary environments…” Source: RevenueBase Database · checked Sep 22, 2026
4	Carnow, Conibear & Assoc., LTD	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	52 contacts →
	Indirect evidence “Carnow, Conibear & Assoc, Ltd.(Carnow Conibear), a minority-owned, woman-owned and veteran-owned business, was established in 1975.” Source: RevenueBase Database · checked Sep 22, 2026
5	Aeterra, LLC	Strong evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	43 contacts →
	Strong evidence “Aeterra is a full-service environmental and sustainability consulting firm that provides operating businesses and their owners with meaningful, practical, business-focused advice.” Source: RevenueBase Database · checked Sep 22, 2026
6	Carbon Solutions Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	42 contacts →
	Indirect evidence “Carbon Solutions Group was founded in Chicago, Illinois, in 2006.” Source: RevenueBase Database · checked Sep 22, 2026
7	Center For Sustainability And Excellence - CSE	Strong evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	34 contacts →
	Strong evidence “The Center for Sustainability and Excellence (CSE) is a global leader in ESG consulting, Net Zero strategy, and Circular Economy solutions.” Source: RevenueBase Database · checked Sep 22, 2026
8	National Retrofitting Group, LLC	Strong evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	30 contacts →
	Strong evidence “National Retrofitting Group provides sustainability consulting along with a variety of energy retrofitting services to help our customers save money on their energy bills while…” Source: RevenueBase Database · checked Sep 22, 2026
9	Aero Performance Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “We collaborate with you to develop a comprehensive facility optimization program, blending our engineering expertise with practical field experience and advanced technology.” Source: RevenueBase Database · checked Sep 22, 2026
10	Carlson Environmental, A Nova Group, GBC Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	17 contacts →
	Indirect evidence “Carlson Environmental, a Nova Group, GBC Company, was originally founded in 1988 by Dr.” Source: RevenueBase Database · checked Sep 22, 2026
11	360 Energy Group	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	16 contacts →
	Partial evidence “360 Energy Group is an energy consulting firm that provides comprehensive energy solutions to the public and private sectors in the United States and worldwide, including energy…” Source: RevenueBase Database · checked Sep 22, 2026
12	ECO Achievers	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	14 contacts →
	Indirect evidence “Eco Achievers helps property owners smartly transform their buildings into healthy, resilient and efficient places.” Source: RevenueBase Database · checked Sep 22, 2026
13	Strategic Growth Consulting, INC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	13 contacts →
	Partial evidence “Strategic Growth Consulting helps small to medium sized professional service companies identify, plan and execute growth strategies bringing over 30 years of experience in the…” Source: RevenueBase Database · checked Sep 22, 2026
14	Captios Partners	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	12 contacts →
	Indirect evidence “Captios Partners is a professional services and engineering consultancy dedicated to bringing global resources and businesses together to create quality product strategies…” Source: RevenueBase Database · checked Sep 22, 2026
15	Husarch	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	9 contacts →
	Indirect evidence “HUSARCH collaborates with architectural, energy, and construction industry leaders to develop actionable, data driven solutions.” Source: RevenueBase Database · checked Sep 22, 2026
16	Ampliqore	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	8 contacts →
	Partial evidence “As a global full-service sustainability agency, we help organisations stay eligible for markets, capital, and regulation by turning sustainability into a source of resilience…” Source: RevenueBase Database · checked Sep 22, 2026
17	Inova Energy Group	Strong evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	7 contacts →
	Strong evidence “Inova Energy Group is a certified WBE offering management consulting, strategic planning, and project delivery solutions in the areas of energy and sustainability.” Source: RevenueBase Database · checked Sep 22, 2026
18	The Astor Company	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	7 contacts →
	Indirect evidence “The Astor Company opened its doors almost 20 years ago as a cardboard recycling company, beginning a journey of continuous adaptation and evolution which today finds a world-class…” Source: RevenueBase Database · checked Sep 22, 2026
19	BGP Advisory	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	6 contacts →
	Indirect evidence “Operators supporting operators.” Source: RevenueBase Database · checked Sep 22, 2026
20	Climate Resilience Consulting	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	5 contacts →
	Partial evidence “Celebrating 10 years of service in 2026, Climate Resilience Consulting helps states, cities and small businesses turn climate risk into resilience.” Source: RevenueBase Database · checked Sep 22, 2026
21	Kairos Worldwide	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	5 contacts →
	Partial evidence “Kairos Worldwide is a proven leader in process engineering consulting and is dedicated to reducing waste and enabling robust, sustainable growth for all types of clients.” Source: RevenueBase Database · checked Sep 22, 2026
22	E4, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	5 contacts →
	Indirect evidence “E4 LLC is a trusted advisor to C&I and municipal clients navigating the evolving clean energy landscape.” Source: RevenueBase Database · checked Sep 22, 2026
23	Environmental Group Services Limited Egsl	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	4 contacts →
	Partial evidence “Environmental Group Services, Ltd.(EGSL) is a full service environmental engineering, training and consulting company located in Chicago, Illinois.” Source: RevenueBase Database · checked Sep 22, 2026
24	Greenleaf Advisors, LLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	1-10	3 contacts →
	Partial evidence “Greenleaf Advisors is a consulting and transaction-services firm that builds sustainable enterprises and communities by bridging them to the resources and strategies they need to…” Source: RevenueBase Database · checked Sep 22, 2026
25	Kathleen Wood Partners	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 22, 2026	11-50	3 contacts →
	Indirect evidence “Awarded Inc's 2022 and 2023 #PowerPartner Award!” Source: RevenueBase Database · checked Sep 22, 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: sustainability consulting services. 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 sustainability consulting services.
Partial evidence: Its own public description names part of sustainability consulting services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainability consulting services. 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 89 sustainability consulting services based in Chicago, United States

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Sustainability consulting services based in Chicago, United States at a glance

As of Sep 22, 2026

34.5%Verified-email coverage

9.3Average contacts per company

1-10Median size (employees)

210.1%Largest-city concentration · New York

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 89 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 sustainability consulting services, 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 Chicago, United States whose own description of what they do matches “sustainability consulting services”. 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 sustainability consulting services), 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 sustainability consulting services, and records with no verified work email. Companies headquartered outside Chicago 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, 285 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 22, 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.

Sustainability consulting services by metro in the United States

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 sustainability consulting services, 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 sustainability consulting services are there based in Chicago, United States?

RevenueBase identified 89 sustainability consulting services headquartered in Chicago, 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?

SUMAC, headquartered in Chicago, tops this list with the largest team on record.

Which city has the most sustainability consulting services?

New York leads with 187 headquartered companies, followed by Houston (106) and Chicago (89).

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 285 verified decision-maker contacts tracked across these 89 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 22, 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.