The Ministry of Environment and Forestry (KLHK) stated that Indonesia produces 175,000 tons of waste per day or the equivalent of 64 million tons per year. Of the total waste, 15% or the equivalent of 9.6 million tons consists of plastic waste. The events above prove that plastic waste is one of the causes that can damage the environment. However, the amount of waste generated should make people aware not to use plastic excessively and to dispose of waste in its place. One of the biggest suppliers of plastic waste is through the buying and selling process. Therefore, growing ecological awareness is urgent to do. This article aims to determine the ecological awareness possessed by traders and buyers and to find out the use of plastic bags in buying and selling MUI fatwas. This article uses qualitative research methods. This article is library research. The data in this study come from library sources such as books, scientific articles, internet websites, research reports, government regulations, laws, and so on. Then analyzed using qualitative data analysis techniques Miles et al. Namely data condensation, data presentation, and drawing conclusions. The results of the study show that every Muslim has an obligation to maintain the cleanliness of the environment, utilize goods that can still be used to create benefit and avoid evil. Disposing of waste carelessly and disposing of items that can still be used, both for personal and other people’s interests, is haram.