Akademik Veri Yönetim Sistemi
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.39, sa.4, ss.2435-2445, 2024 (SCI-Expanded)
Following the industrial revolution, factors such as accelerated industrial processes, increased population, urbanization, and deforestation contributed to a variety of environmental issues, particularly global warming. This study proposes a new Data Envelopment Analysis model to assess the environmental activities of developed and developing countries that have signed the Kyoto Protocol. Using the proposed model, Decision Making Units (DMUs) with similar performance were clustered by creating efficient boundaries, and the efficiency improvement of the effective DMUs in each cluster on each other, as well as the efficiency improvement on the ineffective DMUs in the entire data set, were examined. The final efficiency score of the proposed model is calculated by adding the initial efficiency score, which expresses the initial position of the DMUs, and the efficiency improvement over all DMUs. Finally, the full ranking is obtained by sorting the clusters from smallest to largest, as well as the final efficiency scores of the DMUs within each cluster, from largest to smallest. During the study's implementation phase, the environmental effectiveness of 38 countries that signed the Kyoto Protocol and whose data can be accessed based on determined input/output was assessed using the proposed model. The undesirable input/output problem encountered in environmental effectiveness evaluation was addressed by determining a monotonically decreasing function. The ranking obtained with the proposed model was compared to three different models found in the literature. The proposed model defined seven clusters, and Sweden, Switzerland, Iceland and Norway were in the 1st cluster as the DMUs with the highest efficiency scores.