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Purpose From the green supply chain management (GSCM) approach, the purpose of this paper is to propose a green index as a benchmarking tool to assess environmental performance in manufacturing companies. The index involves 10 green practices and 46 performance dimensions, which were identified by way of an exhaustive literature review. Design/methodology/approach The GSCM index was designed as follows: survey design; experts group selection; relationship identification and green practice weighting (DEMATEL method); and GSCM index construction. The proposed GSCM index was validated at a set of ten Colombian manufacturing companies, which belong to different industrial subsectors. Findings The structural relationships between both green practices and performance dimensions (cause group vs effect group) were determined. Consequently, a set of green practices and performance dimensions on which managers must focus their environmental efforts (cause group), in order to positively affect the system as a whole, was identified. The environmental performance of a set of manufacturing companies was established. Practical implications As a decision support tool, the GSCM index provides a baseline for the deployment of environmental improvement plans. It also permits the comparison of environmental performance between companies from different industrial sectors. Further, it can be used to monitor internal operations and collaboration programs in each echelon of the supply chain. Originality/value This publication contributes to the field of environmental performance measurement by introducing a new index, from the GSCM perspective. In contrast with the existing green indicators, the proposed index is the first to consider causal relationships between green practices and between their performance dimensions.

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PurposeThis study aims to explore manufacturing companies' environmental performance with the green supply chain management (GSCM) approach, taking into account company size, geographic region, industrial sector, target market and environmental management maturity level.Design/methodology/approachBased on the literature review, five propositions were put forward. An empirical study, using survey research, was completed. The survey questionnaire was designed with 46 items, using both the literature and industry expert input. Statistical analysis was employed to test the propositions in a sample of 116 Colombian manufacturing companies.FindingsThe test results indicate that significant environmental performance differences exist, given company sizes and target markets. However, no statistical significance was found involving the geographic region or industrial sector. Significant differences were found in maturity levels between the three clusters identified: reactive, preventive and proactive. Although the companies in the proactive group performed better, they still lagged in green practices that implied integration with suppliers and customers.Practical implicationsThis study provides empirical evidence regarding the profile of those manufacturing companies that achieve better environmental performance. Moreover, the results yield insights for the generation of continuous improvement processes in companies with lower performance.Originality/valueFew empirical studies have been carried out in GSCM that integrate specific factors in the environmental performance assessment of manufacturing companies in developing countries. On the other hand, the results permit the identification of the profile of those companies with greater maturity in their environmental practices.

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