Company lists · Data refreshed September 2026

Top 25 Sustainability and climate change consulting firms based in Chicago, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 72 companies tracked

RevenueBase identified 72 company matches for sustainability and climate change consulting firms associated with Chicago, United States as of September 2026 and tracks 781 professional contacts across them, including 277 with verified work emails. Across the United States, New York is the largest hub for this category (198 companies); Chicago has 72.

This list covers company matches for sustainability and climate change consulting firms associated with Chicago, 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

72Companies

781Contacts tracked

277Verified emails

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The 25 largest sustainability and climate change consulting firms based in Chicago, United States

Ranked by team size

Top 25 of 72 company matches for sustainability and climate change consulting firms based in Chicago, 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	SUMAC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	51-200	183 contacts →
	Exact match “SUMAC is an architecture, engineering, and consulting firm that promotes sustainability as the key element to increasing the profitability of our clients and partners.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	WRD Environmental	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	64 contacts →
	Exact match “WRD Environmental helps organizations committed to sustainability realize their vision.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Fitzgerald	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	56 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Carnow, Conibear & Assoc., LTD	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	52 contacts →
	Exact match “Carnow, Conibear & Assoc, Ltd.(Carnow Conibear), a minority-owned, woman-owned and veteran-owned business, was established in 1975.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Aeterra, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	43 contacts →
	Exact match “Aeterra is a full-service environmental and sustainability consulting firm that provides operating businesses and their owners with meaningful, practical, business-focused advice.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Carbon Solutions Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	42 contacts →
	Exact match “Carbon Solutions Group was founded in Chicago, Illinois, in 2006.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Greenprint Partners	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	41 contacts →
	Exact match “Greenprint Partners is an award-winning consulting firm specializing in community-centered environmental infrastructure.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Center For Sustainability And Excellence - CSE	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	34 contacts →
	Exact match “The Center for Sustainability and Excellence (CSE) is a global leader in ESG consulting, Net Zero strategy, and Circular Economy solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	National Retrofitting Group, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	30 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	Carlson Environmental, A Nova Group, GBC Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	17 contacts →
	Exact match “Carlson Environmental, a Nova Group, GBC Company, was originally founded in 1988 by Dr.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Strategic Growth Consulting, INC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	13 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Captios Partners	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	12 contacts →
	Exact match “Captios Partners is a professional services and engineering consultancy dedicated to bringing global resources and businesses together to create quality product strategies…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Husarch	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	9 contacts →
	Exact match “HUSARCH collaborates with architectural, energy, and construction industry leaders to develop actionable, data driven solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Ampliqore	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	8 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Inova Energy Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	7 contacts →
	Exact match “Inova Energy Group is a certified WBE offering management consulting, strategic planning, and project delivery solutions in the areas of energy and sustainability.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	The Astor Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	11-50	7 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	BGP Advisory	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	6 contacts →
	Exact match “Operators supporting operators.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Climate Resilience Consulting	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	5 contacts →
	Exact match “Celebrating 10 years of service in 2026, Climate Resilience Consulting helps states, cities and small businesses turn climate risk into resilience.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	E4, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	5 contacts →
	Exact match “E4 LLC is a trusted advisor to C&I and municipal clients navigating the evolving clean energy landscape.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	Apmonarch Architecture	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	4 contacts →
	Exact match “APMonarch is a Chicago based architecture firm with the ethos to design healthier buildings and equitable communities.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Greenleaf Advisors, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	3 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	ESG OWL	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	3 contacts →
	Exact match “Fractional Sustainability for Manufacturing.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Mcgrath Architects	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	2 contacts →
	Exact match “Recognized as one of Chicago's premier sustainable, full service, architectural practices serving residential and commercial clients.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Tournant, INC	Exact match	Chicago, United StatesHQ recorded Sep 21, 2026	1-10	2 contacts →
	Exact match “Better Insights.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Himmelfarb Sustainability Consulting	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	1-10	2 contacts →
	Exact match “Himmelfarb Sustainability Consulting is a sustainability and social impact consultancy that supports businesses, industry associations, and nonprofits; and the public relations…” 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 “sustainability and climate change 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 72 sustainability and climate change consulting firms based in Chicago, United States

See the full list, filter by size, metro and specialty, and access 277 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainability and climate change consulting firms based in Chicago, United States at a glance

As of Sep 21, 2026

35.5%Verified-email coverage

10.8Average contacts per company

1-10Median size (employees)

Sep 21, 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 72 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 Chicago, United States whose business descriptions match “sustainability and climate change 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 277 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.

Sustainability and climate change consulting firms by metro in the United States

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

How many sustainability and climate change consulting firms are there based in Chicago, United States?

RevenueBase identified 72 company matches for sustainability and climate change consulting firms associated with Chicago, 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?

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

Which city in the United States has the most sustainability and climate change consulting firms?

New York leads the United States with 198 company records, followed by Houston (79) and Washington (77). Chicago has 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 277 professional contacts with verified work emails tracked across these 72 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.