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Sustainable environmental performance (SEP) among small and medium-sized enterprises (SMEs) has attracted researchers and practitioners’ attention. The achievement of sustainable environmental performance has been largely dependent on the prevailing external ecosystem conditions. Yet in emerging economies such as Ghana, there is limited research and evidence on the extent to which external ecosystem resources influence sustainable environmental performance. This study aims to investigate how external entrepreneurial ecosystem resources including policy, access to finance, market availability, institutional support, human capital and culture influence the sustainable environmental performance (SEP) of small and medium-sized enterprises (SMEs) using sample data from Ghana. A total of 386 SME manufacturing and service firms were sampled to participate. Structural equation modeling (PLS-SEM) tested a multi-theory framework grounded in the Resource-based View (RBV), Resource Dependency Theory (RDT) and Stakeholder Theory. The results indicate that policy, finance, institutional support, and markets exert significant positive effects on SMEs’ SEP. Culture and human capital were found to have a weaker contribution to SMEs’ SEP. The novelty of this study lies in empirically demonstrating the primacy of ecosystem structural levers over softer ecosystem factors in driving SME sustainable environmental performance, thereby offering a new explanatory hierarchy of ecosystem drivers for sustainability in developing economies. We advance the RBV, RDT and the Stakeholder Theory by showing that external ecosystem resources act as critical environmental enablers for SMEs in developing economies. The findings offer globally relevant policy insights for advancing SDGs 12 (Responsible Consumption and Production) and 13 (Climate Action) through targeted ecosystem interventions.