The Sustainability Special Interest Group (SUS-SIG) of EMWA was established in 2020 to support the United Nations 2030 agenda for sustainable development from the perspective of a not-for-profit professional organisation for medical writers and communicators. One of the SUS-SIG’s initiatives was to estimate EMWA’s carbon footprint, which can serve as a baseline for future carbon reduction strategies. This article presents the first estimate of EMWA’s annual greenhouse gas emissions, expressed as CO2 equivalent (CO2E). Medical Writing. 2023;32(2):72–80. https://doi.org/10.56012/irio5824