Current accounting systems assume a purely financial approach, without including environmental information, such as environmental costs and companies’ expenses. On the one hand, this study proposes a framework that considers the environmental impact of firms within their accounting system, the Green Accounting System (GAS). On the other hand, and in the context of developing countries, Colombia carried out an exploratory study. With a sample of 150 Colombian industrial and commercial companies, this research revealed that 100% of them had not yet implemented environmental practices within the accounting system. Therefore, this research would be useful not only for academia, but also for practitioners and governments. As GAS would contribute to traceability in the quantification of environmental accounting, it would simultaneously generate a movement toward cleaner production that would increase environmental quality.