To investigate the decoupling effect of Foreign Direct Investment (FDI) on carbon emissions, this study employs nonlinear panel models and threshold regression models to analyze the impact of FDI on economic growth and carbon emissions in RCEP member countries from 2000 to 2023. First, the Tapio decoupling model reveals that since 2012, the relationship between economic growth and carbon emissions has predominantly exhibited a weak decoupling state. Second, the results from the nonlinear panel models and threshold models indicate that FDI has a significant "U-shaped" nonlinear relationship with both economic growth and carbon emissions. Specifically, in terms of economic effects, FDI may ini... More >