Our 2022 emissions inventory 2019 2021 2022 Scope 3: Marsh McLennan’s reported and verified Scope 3 emissions include only Scope 1 24,758 24,130 27,036 our business commercial air travel. The COVID-19 pandemic has shown we can work effectively remotely, and it has also reinforced the value of in-person collaboration. Scope 2 (market based) 82,690 83,443 68,030 While still below pre-pandemic levels, our business travel emissions increased Scope 3 (air travel) 79,556 7,398 50,634 in 2022 as travel rebounded, we returned to the office, and resumed in-person meetings. We also increased our data coverage for air travel related emissions Total Inventory 187,004 114,971 145,700 in 2022.As we look to the future, we will continue to leverage our Green Traveler Program and virtual meeting tools to manage travel emissions. We are evaluating *2019 represents our baseline year for our emissions goals the role of Sustainable Aviation Fuel (SAF) in addressing emissions from travel **Unit of measurement is mtCO e that is unavoidable. 2 ***GHG emissions data was reviewed and veri昀椀ed by third party assurance provider Optera and is available on the ESG page of marshmclennan.com Emissions Intensity by Headcount Scope 1: Our Scope 1 emissions are direct emissions generated from business 2019 2021 2022 operations. As a professional services firm, our Scope 1 emissions come from Scope 1 .33 .28 .31 fleet vehicles, onsite combustion, and fugitive emissions (gases that escape in the process of cooling our buildings and cars). Scope 2 1.09 1.01 .77 Scope 2: Our Scope 2 emissions are indirect emissions from electricity Scope 3 1.05 .09 .57 purchased for our 700 offices. The data included in this report represents Total Inventory 2.47 1.38 1.65 market-based emissions. See below for additional information on energy consumption and renewable energy usage. While our emissions intensity remains below our baseline, it rose again in 2022 as we resumed travel. Energy consumption Energy Consumption Electricity consumption from renewable sources (MWh) – Excluding Fleet 13% Our energy consumption includes electricity used in our offices and data centers as well as fuel 350k 337,967 required for heating and for our vehicle fleet. 300,265 Electricity consumption represents the majority of 300k this usage and transitioning to renewable electricity  Total Non-Renewables is an important part of how we plan to reduce our 250k 13%  Total Renewables emissions. In 2022, 13% of our electricity usage came 200k Of our electricty from renewable sources. usage came from 150k renewable sources 100k 87% 50k 2021 2022 Overview Environment Social Governance Appendix 2022 ESG REPORT 13