This study integrates recently updated National-Scale Volume Biomass (NSVB) estimates with a spatially-aware carbon accounting methodology in the SubRegional Timber Supply (SRTS) model to project forest market dynamics, land use change, inventory, and carbon fluxes for the Southeastern United States through 2070. Using four socioeconomic scenarios from the 2020 Resources Planning Act (RPA) Assessment aligned with IPCC Shared Socioeconomic Pathways (SSPs), we analyze how global market demands int