Over 30% of the global GDP and 60% of the worldwide population are involved in the Belt and Road Initiative (BRI), making it one of the greatest development projects in the world. If infrastructure developments in BRI countries are successful, economic growth in those nations will increase dramatically. Using data from 2005 to 2020, this research examines the relationships between environmental psychology, green finance, and sustainable development and variables such as GDP per capita and its square, green financing, government expenditure, and human capital in 57 strategically chosen BRI economies. Economists used cutting-edge techniques that take into account multiple variables at once in their analysis, such as cross-sectional dependence, unit root testing, co-integration analysis, IFE estimation, dynamic panel data (DCCE), and generalized method of moments (system GMM). The findings indicate that green financing, government spending, and GDP per capita squared reduce emissions of carbon dioxide. In this analysis, the level of human capital is similar to GDP per capita in its beneficial effect on carbon emissions. Carbon emissions are negatively impacted by government spending, which has a minor effect on GDP per capita, green financing, and human capital. Using the results of this study, the authors offer recommendations for how a country can reduce its carbon output.