Anthropogenic climate change is recognized by the scientific community as a key challenge for human society, with greenhouse gas emissions (GHG) as one of the main drivers. In fact, over the last 10 years, combustion of fossil fuels has been responsible for approximately 86% of the total anthropogenic CO2 emissions. However, the existing policies and the political responses to mitigation are so far insufficient to achieve the goals of the Paris Agreement. International shipping was one of the sectors excluded from the 2015 Paris Agreement and although it contributes less than 3% to global CO2 emissions, they are expected to increase by 90–130% of 2008 levels by 2050. In this paper, a descriptive analysis of the EU-MRV database was conducted. The EU-MRV database collects major information related to CO2 emissions of ships in the European Economic Area (EEA) from 2018. This study analyses the first six years of the EU-MRV data and traces the future possible impacts of the inclusion of the maritime sector in the EU-ETS. The results highlight the differences between the shipping segments, suggesting the importance of analyzing them singularly. Indeed, the shipping sector includes cargo ships, Ro-Pax and cruise passenger ships. Furthermore, in each segment, the technical and operational differences among vessel categories should be considered. The impacts of the inclusion of the shipping sector in the EU-ETS are not still evident.