Analyzing Climate Change Performance Over the Last Five Years of G20 Countries Using a Multi-Criteria Decision-Making Framework

Abstract

Today, limited resources are decreasing/depleting with the increase in the human population living on Earth. The increased human population brings with it various problems. Different events cause important climate events at the global level, such as the decrease or depletion of water resources with the increase in demand, damage to the ecosystem, health risks, and deterioration of biological diversity. Due to the use of fossil fuels, the formation of GHG (greenhouse gas) emissions and global warming cause significant climate changes. Climate change causes the restriction of environmental and vital activities, the increase of natural disasters, and the extinction of species. This study aimed to evaluate the climate change performance of G20 countries which emit more than 75% of the world’s GHG emissions from 2019 to 2023, using MCDM methods. An objective method, LOPCOW, was used to assign weights while SPOTIS, WISP, and RMSVC methods were used to determine the climate change performances of G20 countries. The findings showed that among G20 countries, the highest performance was found in the United Kingdom and India, while the United States, Canada and Saudi Arabia were found in the last ranks.