Marsh & McLennan Companies, Inc., often referred to as MMC, is a leading global professional services firm headquartered in the United States. Established in 1905, the company has evolved into a powerhouse in the insurance, risk management, and consulting sectors, with significant operations across North America, Europe, and Asia-Pacific. Specialising in risk, strategy, and people, MMC offers a diverse range of services through its well-known subsidiaries, including Marsh, Guy Carpenter, Mercer, and Oliver Wyman. These entities provide unique solutions tailored to meet the complex needs of clients, from insurance brokerage to human resources consulting. With a strong market position, Marsh & McLennan is recognised for its innovative approach and commitment to excellence, consistently achieving notable milestones in the industry. The firm’s dedication to delivering value and insights has solidified its reputation as a trusted partner for organisations worldwide.
How does Marsh & McLennan Companies, Inc.'s carbon action stack up? DitchCarbon scores companies based on their carbon action and commitment to reducing emissions. Read about our methodology to learn more.
Mean score of companies in the Business Services industry. Comparing a company's score to the industry average can give you a sense of how well the company is doing compared to its peers.
Marsh & McLennan Companies, Inc.'s score of 87 is higher than 93% of the industry. This can give you a sense of how well the company is doing compared to its peers.
In 2024, Marsh & McLennan Companies, Inc. reported total carbon emissions of approximately 688,000,000 kg CO2e, with significant contributions from Scope 1, 2, and 3 emissions. Specifically, Scope 1 emissions were about 18,865,000 kg CO2e, while Scope 2 emissions (market-based) totalled approximately 16,038,000 kg CO2e. The majority of their emissions stemmed from Scope 3, which accounted for about 662,042,000 kg CO2e, highlighting the substantial impact of their supply chain and business travel activities. Marsh & McLennan has set ambitious climate commitments, aiming for net-zero carbon emissions across its global operations by 2050. They have established a near-term target to reduce absolute Scope 1 and 2 greenhouse gas emissions by 50% by 2030, using 2019 as the baseline year. Additionally, they aim to reduce Scope 3 emissions from purchased goods and services, capital goods, and business travel by 55% per million USD of operating profit within the same timeframe. Long-term goals include a 90% reduction in absolute Scope 1 and 2 emissions by 2050, alongside a 97% reduction in Scope 3 emissions per million USD of operating profit. These targets are aligned with the Science Based Targets initiative (SBTi) and reflect the company's commitment to sustainable practices within the professional services sector.
Access structured emissions data, company-specific emission factors, and source documents
| 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | |
|---|---|---|---|---|---|---|---|
| Scope 1 | 19,158,500 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 |
| Scope 2 | 75,126,200 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 | 00,000,000 |
| Scope 3 | 73,780,300 | 000,000,000 | 00,000,000 | 0,000,000 | 000,000,000 | 000,000,000 | 000,000,000 |
Marsh & McLennan Companies, Inc.'s Scope 3 emissions, which increased by 33% last year and increased by approximately 797% since 2018, demonstrating supply chain emissions tracking. Nearly all of their carbon footprint comes from suppliers and value chain emissions, representing nearly all emissions under the GHG Protocol, with "Purchased Goods and Services" being the largest emissions source at 59% of Scope 3 emissions.
Climate goals typically focus on 2030 interim targets and 2050 net-zero commitments, aligned with global frameworks like the Paris Agreement and Science Based Targets initiative (SBTi) to ensure alignment with global climate goals.
Marsh & McLennan Companies, Inc. has established climate goals through participation in recognized frameworks and target-setting initiatives. Companies often set interim 2030 targets and long-term 2050 net-zero goals to demonstrate measurable progress toward decarbonization.

Common questions about Marsh & McLennan Companies, Inc.'s sustainability data and climate commitments