Research Information System
IAC-MEM 2025, Praha, Czech Republic, 14 - 15 December 2025, pp.43-51, (Full Text)
The increasing importance of Environmental, Social, and
Governance (ESG) factors in the financial sector has placed greater emphasis on
assessing banks’ sustainability performance, particularly with respect to
environmental dimensions. This study aims to provide a comparative analysis of
banks by evaluating their performance scores on environmental sustainability
criteria against their closest competitors. Given the qualitative nature of the
data related to environmental factors, triangular fuzzy numbers were employed
to capture the subjective assessments of the decision-makers regarding each
bank’s performance. To objectively determine the relative importance degree of
the criteria, a decision support model based on the common-weight fuzzy data
envelopment analysis (DEA) is utilized. Unlike traditional approaches, this
method does not rely on subjective weight assignment; instead, it incorporates
criterion weights as decision variables within a mathematical programming
framework. By solving the DEA-based model, performance scores for each bank are
obtained, enabling an objective ranking within the context of environmental
sustainability. The results not only highlight the relative competitive
positioning of banks but also identify critical environmental criteria that
should be prioritized for further improvement. Consequently, this study
contributes to the literature by presenting a rigorous, comparative, and
data-driven framework for analysing banks’ environmental sustainability
performance within the broader ESG perspective.