- Climate change impacts (extreme weather, supply chain disruptions)
- Cybersecurity threats
- Attracting and retaining top talent
- Pay equity
- ESG complexity and evolving stakeholder expectations
Marsh & McLennan Companies, Inc.
Greenhouse gas emissions & sustainability report data
In its 2023 reporting, Marsh & McLennan Companies, Inc. disclosed greenhouse gas emissions of 456.2K tCO2e (2022). By scope: Scope 1: 23.6K tCO2e (2023); Scope 2: 71.7K tCO2e (2022); Scope 3: 361.5K tCO2e (2022). Figures are as stated in the company's own report and may use different boundaries, units or methods (for example market-based vs location-based Scope 2), so compare with care.
GHG Emissions
456.2K tCO2e (2022)
2023
Renewable Energy
62% (2023)
of total energy
Energy Use
352.0K MWh (2022)
2023
📊 Emissions by Scope (2023)
| Scope | What it covers | Reported value |
|---|---|---|
| Scope 1 | Direct emissions from sources the company owns or controls (fuel combustion, company vehicles, process and fugitive emissions). | 23.6K tCO2e (2023) |
| Scope 2 | Indirect emissions from purchased electricity, steam, heat and cooling. | 71.7K tCO2e (2022) |
| Scope 3 | Other indirect emissions across the value chain (purchased goods, business travel, use of sold products, etc.). | 361.5K tCO2e (2022) |
New to scopes? Read Scope 1, 2 and 3 emissions explained and market-based vs location-based Scope 2.
📈 Emissions by Report Period
| Report period | Headline emissions figure reported |
|---|---|
| 2023 | 456.2K tCO2e (2022) |
Each row is the headline figure extracted from a different report; scope coverage and methodology can change between years.
✅ Reported Environmental Achievements
- 45% reduction in Scope 1 and 2 emissions since 2019
- Achieved CarbonNeutral® certification for the third consecutive year
- Implemented renewable electricity across major US, UK, and South Africa offices
- 95% of construction waste diverted from landfill at NY headquarters
- 90-kW solar panel array installed in Brussels office
- Partnership with Mangrove Breakthrough to protect mangrove habitats
- Launched community-based catastrophe insurance pilot in NYC
🎯 Climate & Sustainability Targets
📅 Medium-term
- 50% emissions reduction by 2030
🔭 Long-term
- Net-zero emissions across global operations by 2050
🌱 ESG Focus Areas
Climate ChangeDiversity & InclusionGovernanceSupply Chain SustainabilityEmployee Well-being