The seaborne trade accounts for approximately 90 per cent of the global trade and economy, proving the power of this industry. The maritime transport of goods and raw materials remains the most cost-effective and energy-efficient means of transporting of large volume of cargo in comparison to road and rail. Nevertheless, the need for the immediate international actions on the climate crisis and global warming entails the reduction of emissions resulting from all sectors. The Kyoto Protocol indicated in its Article 2.2 the International Maritime Organization (IMO) as the global regulator for the reduction of emissions from international shipping. In line with that the International Maritime Organization (IMO) has developed a regulatory framework addressing to the control of the emissions of the air pollutants and to the improvement of ship energy efficiency, by limiting the emissions of the greenhouse gases. This thesis includes the main regulatory measures adopted for the reduction of the emissions of the Sulphur Oxides (SOx), Particulate Matter (PM), Nitrogen Oxides (NOx), and of the greenhouse gases (GHG), including Carbon Dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O), expressed in CO2e and concludes to the significance of the efforts of the International Maritime Organization (IMO) into minimizing the impact of the international shipping to the climate change.