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This study uses the Gregory–Hansen cointegration method and the vector error correction model in the vector autoregression system to reveal how international trade contributes to economic sustainability. The Gregory–Hansen test for cointegration method reveals a permanent equilibrium relation among sustainably economic growth, exports, and imports and shows that exports facilitate GDP growth and accelerate improvements in the capability of imports in the long-run. The causality between GDP and exports is unidirectional, indicating that exports area determinant of sustainable economic growth. The bidirectional causality from imports to GDP also sheds light on the important influence of imports on economic sustainability; however, GDP growth also drives import growth. The interaction between imports and exports corresponds to their bidirectional causal relationship, which is indicative of imports contributing to export production and of export growth expanding the capacity for imports. This finding indicates that imports are both exogenous and endogenous factors for exports.

Green governance is the only way to build a community for humankind with a shared future. Existing research has concentrated more on the macro level rather than the micro level of green governance&mdash, the power hierarchy of the governance subjects and its influence on decision-making and the implementation of green governance. The board of directors is the main green governance body, and the consciousness and conducts of the green governance of board members are determined by corporate mission. As a result, we explored the mechanism of the impact of board power hierarchy on green governance performance through the influence of green governance conduct. To interpret this mechanism, we introduced relational contract theory and conducted an empirical analysis. The results show that board power hierarchy negatively affects green governance conduct. Corporate mission restrains the board power hierarchy&rsquo, s negative influence on green governance conduct, showing that board power structure has a significantly positive effect on green governance performance through the mediator of green governance conduct. Therefore, the positive role of corporate mission is identified.