Top 10: Environmental Consulting Firms

Green consulting firms are now key allies for businesses aiming to meet sustainability goals, guiding them through challenges like carbon reduction, energy efficiency, waste management and eco-friendly supply chains.
With the global sustainability consulting market expected to hit US$16bn by 2027, demand is soaring and these firms offer essential support in tackling Scope 3 emissions, helping businesses lower their environmental impact, boost efficiency and comply with regulations.
As ESG factors gain prominence, green consultancies are becoming critical partners in staying competitive and responsible.
Here, Scope 3 Magazine takes a look at the top 10 environmental consulting firms worldwide.
10. ERM
Founded: 1987
Employees: 8,000
CEO: Tom Reichert
Revenue: US$1bn (approx.)
ERM (Environmental Resources Management) is a top global sustainability consultancy, delivering green solutions to organisations worldwide. Its services cover environmental planning, biodiversity, water management and climate change strategies.
ERM helps businesses assess nature-related risks and opportunities, optimise water management and adopt sustainable practices.
It also guides companies on environmental compliance, permitting and ESG disclosure, aiding the shift towards a nature-positive future.
9. Bain & Company
Founded: 1973
Employees: 19,000
CEO: Manny Maceda
Revenue: US$6bn
Bain & Company provides extensive sustainability consulting through its Global Sustainability Innovation Centre.
Its services include strategic environmental planning, decarbonisation strategies and ESG integration.
Bain helps clients evaluate climate risks, create net-zero plans and implement sustainable practices.
With expertise in carbon reduction, circular economy strategies and sustainable supply chain management, Bain also offers due diligence for assessing carbon exposure in assets and portfolios.
8. AECOM
Founded: 1990
Employees: 72,000
CEO: Troy Rudd
Revenue: US$14.3bn
AECOM provides comprehensive green consultancy services through its Environmental Sustainability division, focusing on carbon and energy management, circular economy applications and climate strategy.
Its ESG Advisory practice offers strategic advice to help organisations build climate resilience, strengthen communities and integrate sustainable development into business operations.
AECOM assists with net-zero planning, nature-positive solutions, ESG risk management and disclosure readiness.
7. McKinsey & Company
Founded: 1926
Employees: 45,000
CEO: Bob Sternfels
Revenue: US$16bn
McKinsey provides extensive sustainability consulting through its McKinsey Sustainability practice.
It assists clients in achieving net-zero targets, building climate resilience and adopting sustainable business practices.
With expertise in carbon reduction, circular economy strategies and nature-based solutions, McKinsey’s approach combines industry knowledge, digital tools and partnerships with sustainability experts to deliver innovative solutions across sectors.
Its services cover everything from developing ESG strategies to implementing and measuring sustainability initiatives, helping organisations drive long-term sustainable growth.
6. Tata Consultancy Services (TCS)
Founded: 1968
Employees: 600,000
CEO: K. Krithivasan
Revenue: US$28.8bn (approx.)
Tata Consultancy Services (TCS) delivers robust green consultancy services through its ESG Integration Suite and Envirozone solution.
TCS helps clients track and enhance ESG performance, cut carbon emissions and adopt sustainable business practices. Its services range from strategic environmental planning and decarbonisation strategies to sustainability reporting.
It empowers organisations across sectors to transition towards a more sustainable future, driving both environmental impact and business success.
5. KPMG
Founded: 1987
Employees: 273,000
CEO: William B. Thomas
Revenue: US$36bn
KPMG delivers a wide range of sustainability consulting services through its global ESG practice.
Offering decarbonisation strategies, net-zero planning, renewable energy solutions and climate change risk assessments, KPMG helps clients navigate the complex sustainability landscape.
KPMG supports organisations in implementing circular economy strategies, water and nature-related disclosures and effective ESG governance models.
Leveraging industry knowledge, digital tools like Climate IQ, and partnerships with technology leaders, KPMG provides innovative, sector-spanning sustainability solutions, helping businesses achieve their environmental goals and future-proof their operations.
4. PwC
Founded: 1998
Employees: 364,000
CEO: Mohamed Kande
Revenue: US$53.1bn
PwC offers comprehensive sustainability consulting through its global sustainability practice. Offering expertise in ESG integration, green taxes and incentives and real-time emissions tracking, PwC helps businesses stay ahead in a changing landscape.
Its approach blends industry knowledge, innovative tech solutions like the Sustainability Tech Suite and data-driven insights to craft tailored sustainability solutions.
PwC empowers organisations across sectors to manage their environmental impact, drive sustainability and meet evolving regulatory demands.
3. EY
Founded: 1989
Employees: 395,000
CEO: Carmine Di Sibio
Revenue: US$49.4bn
EY offers extensive sustainability consulting through its global Sustainability practice, helping organisations tackle climate change, adopt sustainable finance solutions and integrate ESG strategies.
It guides clients in creating net-zero roadmaps, rolling out decarbonisation strategies and improving ESG performance.
With expertise in carbon management, circular economy applications and sustainable supply chains, EY’s approach blends industry insights, digital tools like EY Carbon and strategic partnerships to craft innovative sustainability solutions.
From ESG strategy development to sustainability reporting and assurance, EY supports businesses in creating long-term value and meeting stakeholder expectations.
With EY as a partner, organisations can confidently navigate the evolving sustainability landscape while driving meaningful impact.
2. Deloitte
Founded: 1845
Employees: 457,000
CEO: Joe Ucuzoglu
Revenue: US$64.9bn
Deloitte focuses on delivering a comprehensive array of sustainability consulting services through its global Sustainability and Climate practice. The firm specialises in developing tailored sustainability strategies, planning for decarbonisation, integrating ESG factors and conducting climate risk assessments.
Deloitte partners with clients to weave sustainability into their operations, helping them navigate the complexities of regulatory requirements while driving transformation for lasting value. Its expertise spans carbon management, circular economy practices and sustainable supply chain solutions.
By combining deep industry knowledge with cutting-edge digital tools like GreenSpace Tech and CarbonCompass, Deloitte delivers innovative, data-driven insights.
From ESG strategy development to sustainability reporting and assurance, the firm supports organisations every step of the way toward a greener, more sustainable future.
1. Accenture
Founded: 1989
Employees: 733,000
CEO: Julie Sweet
Revenue: US$64.1bn
Accenture focuses on delivering a comprehensive suite of sustainability consulting services through its global Sustainability practice. The firm excels in crafting decarbonisation strategies, integrating ESG factors and driving sustainable business transformation.
Accenture assists clients in developing net-zero roadmaps, implementing climate risk assessments and enhancing overall ESG performance. Its approach combines deep industry knowledge with innovative digital tools like the Green Cloud Advisor.
Services extend from sustainability strategy development to implementation and measurement, empowering organisations to create long-term value. Accenture has further strengthened its capabilities through strategic acquisitions of sustainability consultancies, including Green Domus, Akzente and Avieco.
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