A b s t r a c tAs it is known, The Kyoto Protocol is an international agreement aims to reduce global warming and manmade greenhouse gas emissions. Approximately 160 countries entered into framework of the Kyoto Protocol and our world is polluted by about 50 countries mostly. The purpose of this study is to investigate values and the trends of performances of environmental/greenhouse gas emissions of these 50 most polluted countries in period of 2005-2015. At the same time, it is examined that the trend of the performance of Turkey in the concerned years. Window Analysis (WA) is a DEA and operational research (OR) based technique. DEA captures a moment photograph, each application is a cross-sectional analysis of data. In some applications, observations for DMUs are available over multiple time periods, so to perform an analysis where interest focuses on changes over time is important. WA gives us trend of changes of performance over time, and also details of the stability of performance.
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