Shared mobility technologies and services – micromobility (bikeshare and e-scooter share), microtransit, carsharing, ride-hailing, and autonomous vehicles (AVs) – are having profound effects on how people live, move, and spend time in cities, and increasingly on urban form and development itself. Public agencies have just begun to develop and adopt regulations and programs to manage shared services. At the same time, public agencies are interested in these services’ greenhouse gas (GHG) emissions and their ability to improve equitable transportation. This article reviews the academic and grey literature on the impact of shared mobility on GHG emissions with a focus on equitable mobility. Our findings show that the modes with the lowest GHG emissions are walking, personal and shared biking, personal and shared e-scooters, and public transit. The modes with the highest actual or modeled GHG emissions are personally owned vehicles, ride-hailing trips, and potentially AVs.