In 2025, Marsh & McLennan Companies completed a corporate carbon footprint assessment and publicly disclosed its greenhouse gas (GHG) emissions according to the GHG Protocol, covering Scope 1 (direct emissions from owned or controlled sources), Scope 2 (indirect emissions from purchased energy) and Scope 3 (indirect emissions across the value chain).
Marsh & McLennan Companies has also provided a category-level breakdown for 10 out of 15 Scope 3 emissions categories, offering greater transparency into its value chain emissions.
| Metric (tCO2e) | 2025 | 2024 | 2023 | 2022-2019 |
|---|---|---|---|---|
Total Scope 1 | 21,108a | 19,820b | 23,637c | |
Total Scope 2 | ||||
Market-Based | 7,964a | 16,818b | 34,298c | |
Location-Based | 55,858b | 61,374b | 68,809c | |
Total Scope 3 | 630,475a | 676,407b | 498,072c | |
Total Scope 1 Revenue Intensity (tCO2e/$M) | 0.7823a | 0.8104b | 1.0396c |
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In 2025, the total operational greenhouse gas (GHG) emissions of Marsh & McLennan Companies amounted to 76,966 metric tons of CO2 equivalent. This figure includes both direct emissions from owned or controlled sources (Scope 1) and indirect emissions from purchased energy (Scope 2).ab
Compared to 2024, the total operational greenhouse gas (GHG) emissions of Marsh & McLennan Companies decreased by 5.21%, showing that the company has made progress in taking action to reduce the climate impact of its operations.ab
In 2025, the total Scope 1 emissions of Marsh & McLennan Companies were 21,108 metric tons of CO₂ equivalent (tCO₂e).a
Since 2019, Marsh & McLennan Companies's Scope 1 emissions have decreased by 17.21%, reflecting a declining long-term trend in Scope 1 emissions over time.ab
Compared to the previous year (2024), Marsh & McLennan Companies's Scope 1 emissions increased by 6.5%, suggesting that the company faced challenges in reducing emissions from its directly owned or controlled operations.ab
In 2025, Marsh & McLennan Companies reported Scope 2 greenhouse gas (GHG) emissions of 7,964 tCO₂e using the market-based method and 55,858 tCO₂e using the location-based method.ab
Since 2019, Marsh & McLennan Companies's Scope 2 greenhouse gas (GHG) emissions (Location-Based) have decreased by 34.2%, reflecting a declining long-term trend in Scope 2 emissions over time.b
Compared to the previous year (2024), Marsh & McLennan Companies's Scope 2 emissions (Location-Based) have remained relatively stable, indicating that Marsh & McLennan Companies's emissions have plateaued with no significant change in its energy consumption footprint.b
In 2025, Marsh & McLennan Companies reported its Scope 2 emissions using the market-based method and using the location-based method.ab
In 2025, Marsh & McLennan Companies reported 630,475 metric tons of CO₂ equivalent (tCO₂e) of Scope 3 greenhouse gas (GHG) emissions, representing indirect emissions across its upstream and downstream value chain.a
The 2025 disclosure of Marsh & McLennan Companies includes a breakdown across 10 of the 15 Scope 3 categories defined by the GHG Protocol, matching the level of disclosure in 2024, demonstrating consistent Scope 3 emissions reporting coverage year over year.a
In 2025, Marsh & McLennan Companies reported total Scope 3 emissions of 630,475 metric tons of CO₂ equivalent (tCO₂e).a
Approximately 99.39% of these emissions originated from upstream activities such as purchased goods and capital goods, while 0.61% came from downstream activities like product use, distribution, and end-of-life treatment.a
Since 2019, Marsh & McLennan Companies's Scope 3 emissions have increased by 19.54%, reflecting a rising long-term trend in Scope 3 emissions over time.ab
Compared to the previous year (2024), Marsh & McLennan Companies's Scope 3 emissions remained relatively stable, indicating that Marsh & McLennan Companies's emissions have plateaued with no significant change in its value chain footprint.ab
In 2025, Marsh & McLennan Companies reported emissions for 10 out of the 15 Scope 3 categories defined by the GHG Protocol.a
This reflects a high level of granularity and transparency in the company's emissions reporting.
In 2025, the largest contributors to Marsh & McLennan Companies's Scope 3 emissions were:a
In 2025, Marsh & McLennan Companies reported Scope 1 greenhouse gas (GHG) emissions of 21,108 tCO₂e and total revenues of USD 26,982 millions. This translates into an emissions intensity of 0.78 tCO₂e per millions USD.a
In 2025, Marsh & McLennan Companies reported a Scope 1 emissions intensity of 0.78 tCO₂e per millions USD. Compared to the peer group median of 0.35, this places the company above its industry benchmark, indicating it is less carbon-efficient than most competitors.a
In 2025, Marsh & McLennan Companies ranked 17 out of 25 companies in its industry peer group, based on Scope 1 emissions intensity (measured in tCO₂e per millions USD).a
Marsh & McLennan Companies is therefore positioned in the mid-range of its industry, neither a clear leader nor a laggard in carbon efficiency.a
In 2025, Marsh & McLennan Companies reported a total carbon footprint of 707,441 metric tons of CO₂ equivalent (tCO₂e) across Scope 1, Scope 2, and Scope 3 emissions. This represents a 6.62% decrease compared to 2024, indicating progress in reducing its overall greenhouse gas output.ab
The largest contributor to Marsh & McLennan Companies's total carbon footprint was Scope 3 emissions, accounting for 89.12% of the company's total carbon footprint, followed by Scope 2 emissions at 7.9%.ab