An updated literature review of CO2e calculation in road freight transportation

In recent decades, increasing emphasis is being placed on sustainable freight transport. The aim of this study is to discern how detailed the calculation of CO₂e emissions in road transport is. For this, the study conducted a sample review with 53 scientific sources and 121 annual reports. Only 14 out of the 53 scientific sources incorporated emissions that occur as a by-product of energy supply. Not more than 14 of the 121 companies included emissions from transportation activities of both the upstream and downstream processes. Therefore, the study highlights the necessity for new and validated models to support decision-making processes that sustainably reduce CO₂e emissions.