Emission of greenhouse gases such as CO2 is highly dependent on the energy systems of the countries. In this regard, for accurate analysis of CO2 emission it is necessary to take into account the factors related to energy consumption. In the present paper, three countries including Turkey, Bulgaria and Greece are considered as case studies to model their CO2 by using an economic indicator (GDP) and consumptions of different energy sources. In this regard, Group Method of Data Handling (GMDH) is applied as the method and the required data for modeling between 2000 and 2019 are gathered. The results indicated that R2 values of the proposed model for training, test and overall datasets are 0.9997, 0.9991 and 0.9995, respectively. In addition, AARD of the mentioned datasets were around 0.71%, 1.18% and 0.85%, respectively. These values reveal significant exactness of the proposed which can be attributed to proper selection of both inputs and modeling method.
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