Company lists · Data refreshed September 2026

Top 25 Climate change consulting services based in Washington, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 93 companies tracked

RevenueBase identified 93 climate change consulting services headquartered in Washington, United States as of September 2026 and tracks 937 professional contacts across them, including 494 with verified work emails. New York is the largest hub.

This list covers climate change consulting services headquartered in Washington, 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 21, 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 21, 2026 86% judged on-target in blind review

93Companies

937Contacts tracked

494Verified emails

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The 25 largest climate change consulting services based in Washington, United States

Ranked by team size

Top 25 of 93 climate change consulting services based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to climate change 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	Synergy Consulting, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	51-200	434 contacts →
	Partial evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 21, 2026
2	Peer Consultants, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	51-200	71 contacts →
	Indirect evidence “In 1978, PEER was established under Dr.” Source: RevenueBase Database · checked Sep 21, 2026
3	Baumann Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	51-200	63 contacts →
	Partial evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 21, 2026
4	Northbridge	Indirect evidence	Washington, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “At Northbridge, we provide our clients with the tools and expertise to help solve complex financial, policy, and environmental challenges.” Source: RevenueBase Database · checked Sep 21, 2026
5	The Clark Group LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	19 contacts →
	Partial evidence “The Clark Group is an environmental policy consulting firm that provides a broad range of services to government, private and nonprofit clients.” Source: RevenueBase Database · checked Sep 21, 2026
6	E&w LAW	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	18 contacts →
	Indirect evidence “At Earth & Water, we are more than lawyers – we’re strategic advisors with unique experience who advance our clients’ interests across a broad range of environmental and business…” Source: RevenueBase Database · checked Sep 21, 2026
7	CSR Communications	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	18 contacts →
	Partial evidence “We're the leading experts changing the way organizations manage change.” Source: RevenueBase Database · checked Sep 21, 2026
8	Numark Associates, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
9	Sustainable Capital Advisors	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “Sustainable Capital Advisors (SCA) is a strategy consulting and financial advisory firm focused on delivering innovative capital solutions for the sustainable infrastructure…” Source: RevenueBase Database · checked Sep 21, 2026
10	Climate Advisers	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “Climate Advisers brings together globally recognized climate thought leaders on US policy and politics, international diplomacy, tropical forests and other nature-based solutions…” Source: RevenueBase Database · checked Sep 21, 2026
11	Co2efficient	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	14 contacts →
	Indirect evidence “CO2EFFICIENT LLC (COEFFICIENT) was founded in 2017 as a mission-focused Washington, D.C.” Source: RevenueBase Database · checked Sep 21, 2026
12	Sustainable YOU	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	51-200	14 contacts →
	Partial evidence “Sustainable You is a national strategic consulting firm in solar and sustainability serving residential and small commercial clients with a focus in the DC, Maryland and Virginia…” Source: RevenueBase Database · checked Sep 21, 2026
13	Blackwoods Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Blackwoods Group is an agriculture and natural resource consulting firm that provides a variety of services ranging from government relations to development and implementation of…” Source: RevenueBase Database · checked Sep 21, 2026
14	Green Strategies, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	8 contacts →
	Indirect evidence “Green Strategies Inc.” Source: RevenueBase Database · checked Sep 21, 2026
15	Center For Climate Strategies	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Partial evidence “The Center for Climate Strategies provides high-level support for planning, analysis, and implementation of climate, energy, and economic programs in partnership with government…” Source: RevenueBase Database · checked Sep 21, 2026
16	The Climate Board	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “The Climate Board builds AI-enhanced data products for corporate climate teams, closing the gap between infrequent assessments and real-time risk.” Source: RevenueBase Database · checked Sep 21, 2026
17	Adaptation Leader	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “We provide services to leaders of organizations that want to plan and implement climate adaptation actions to protect and maximize their investments across their programs…” Source: RevenueBase Database · checked Sep 21, 2026
18	Partnership International, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “Partnership International, Inc, founded in 1990, is an international consulting firm that provides socio-economic, regulatory, institutional, technical, commercial and financial…” Source: RevenueBase Database · checked Sep 21, 2026
19	Clima Capital Partners LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Partial evidence “Clima Capital Partners LLC (CLIMA) advises and creates sustainable value for local economies and communities through robust climate finance solutions, managing and mitigating…” Source: RevenueBase Database · checked Sep 21, 2026
20	Green Capitol	Indirect evidence	Washington, United StatesHQ checked Sep 21, 2026	1-10	7 contacts →
	Indirect evidence “Green Capitol LLC works on sustainable development policy at the state, federal and international levels, serving clients on agriculture, energy and environment concerns via…” Source: RevenueBase Database · checked Sep 21, 2026
21	Energy Shrink, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “Energy Shrink is an environmental consulting practice specialized in sustainability and energy efficiency in buildings, that is, high-performance or green buildings.” Source: RevenueBase Database · checked Sep 21, 2026
22	Eliasson Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Indirect evidence “We bring decades of fundraising, organizational development and marketing and communications background to non-profit and for-profit executive leadership, CEOs, philanthropists…” Source: RevenueBase Database · checked Sep 21, 2026
23	38 North Solutions	Partial evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “38 North Solutions is a boutique consulting firm that provides a suite of business strategy and public policy services to innovative businesses and organizations.” Source: RevenueBase Database · checked Sep 21, 2026
24	Oasis Energy Partners	Strong evidence	Washington, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “OASIS Energy Partners is a full-service consulting and advisory firm at the intersection of energy, environment, and climate.” Source: RevenueBase Database · checked Sep 21, 2026
25	ALT Surya	Strong evidence	Washington, DC, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Alt Surya is a global climate advisory firm, which provides expert consulting services to clients in Asia and North America.” Source: RevenueBase Database · checked Sep 21, 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 change 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 climate change consulting services.
Partial evidence: Its own public description names part of climate change consulting services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate change 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 93 climate change consulting services based in Washington, United States

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Climate change consulting services based in Washington, United States at a glance

As of Sep 21, 2026

52.7%Verified-email coverage

10.1Average contacts per company

1-10Median size (employees)

140.9%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 93 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 change 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 Washington, United States whose own description of what they do matches “climate change 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 climate change 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 climate change consulting services, and records with no verified work email. Companies headquartered outside Washington 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, 494 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 21, 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 change consulting services by metro in the United States

Climate change consulting services in New York131
Climate change consulting services in Washington93
Climate change consulting services in Houston85
Climate change consulting services in Chicago66
Climate change consulting services in San Francisco61
Climate change consulting services in Los Angeles50
Climate change consulting services in Portland50
Climate change consulting services in Seattle50
Climate change consulting services in Denver47
Climate change consulting services in Atlanta36
Climate change consulting services in San Diego33
Climate change consulting services in Boston29
Climate change consulting services in Miami29
Climate change consulting services in Austin28
Climate change consulting services in Dallas26
Climate change consulting services in New York City25
Climate change consulting services in Philadelphia25

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 change 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 climate change consulting services are there based in Washington, United States?

RevenueBase identified 93 climate change consulting services headquartered in Washington, 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?

Synergy Consulting, INC, headquartered in Washington, tops this list with the largest team on record.

Which city has the most climate change consulting services?

New York leads with 131 headquartered companies, followed by Washington (93) and Houston (85).

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 494 verified decision-maker contacts tracked across these 93 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 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 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.