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Maritime transport contributes to stimulating the development of civilisation. According to the European Environment Agency, around 1/4 of the total CO2 emissions in the EU in 2019 came from the transport sector, of which 71.7% were from road transport. The share of CO2 emissions from maritime transport is estimated to be about 3% of the world's. In terms of energy demand for moving a specific load over a specific distance, it is currently the cheapest form of transport. The International Maritime Organization's activities aim to reduce the environmental impact of this form of transport. The article discusses the expected effects of the regulations introduced until 2023. Regulations have a significant impact on the increase in transport costs. There may be far-reaching changes in the shipping market that have an indirect (rather unintended) effect due to the introduced regulations. "Side effects" can be very severe, especially for shipowners with a small number of ships. The article attempts to draw attention to such threats. [ABSTRACT FROM AUTHOR]

With stricter IMO regulations on CO2 taking effect in 2023 and ambitious goals to reduce carbon intensity by 2030, the maritime industry is scrambling to clean up its act. Conventional methods and equipment are now being reevaluated, upgraded or completely replaced. The difference between a short-term fix and a long-term sustainable option is how flexible vessels will be to use new energy sources or technology as they become viable. The review discusses the recent literature on renewable energy sources, technical and operational strategies for new and existing ships, technology maturity, and alternative fuels. It is found that the IMO's targets can be met by combining two or three technologies, or via a radical technology shift which can provide innovative, high-efficiency solutions from an environmental and economic standpoint. It has also been noted that policies and enforcement are essential management instruments for mitigating the unfavourable environmental effects of marine transportation and directing the maritime industry toward sustainability on a regional, national, and international scale. [ABSTRACT FROM AUTHOR]

The international maritime organization (IMO) has introduced several legislations to optimize the use of energy generated from machinery onboard ships to reduce the emitted exhaust gas emissions. The aim of the current paper is to study the effect of using emission reduction strategies for container ships with emphasis on the improved Energy Efficiency Design Index (EEDI) from environmental and economic points of view. As a case study, A19 and A7 class container ships are investigated. Three different options are considered including natural gas, treatment equipment, and ship speed reduction. The lowest annual emission rates per transported cargo are achieved by A19. These rates are 18.9, 0.93, and 1.8 kg/TEU for NOx, SOx, and CO2 emissions, respectively. In order to improve the EEDI value for the A7, the ship speed should be reduced by 22.5%. This will comply with the three phases of IMO requirements by reducing CO2 emissions with cost-effectiveness of 52.54 $/ton CO2. On the other hand, using the installed dual-fuel engine infrastructure onboard A19 container ship will improve the energy efficiency by 10.13% with annual fuel saving of 23.73 million dollars. [ABSTRACT FROM AUTHOR]

• Newly implemented IMO regulations require a significant reduction of ship emissions. • Ship emission studies related to switching to low-sulphur fuels are thoroughly reviewed. • Refinery processes to produce low-sulphur fuels require extra energy consumption. • Scope for new regulations to be added to reduce particle number and methane slip. • Future marine fuel mix needs to be involved to meet fuel regulations and emission reduction. This study presents an overview of the context and global impacts of recent International Maritime Organization (IMO) regulations on the marine fuel oil refining industry, future marine fuel mix and ship emissions. IMO limited marine fuel sulphur content in both Sulphur Emission Control Areas (SECAs) and Nitrogen Oxide Emission Control Areas (NECAs) to 0.1% (wt. %) by 2015, and to 0.5% globally by 2020. It is anticipated that the newly implemented IMO regulations will help to mitigate negative impact of ship emissions on public health and environment. IMO regulations require significant changes to refineries to increase the production of low sulphur fuels through a shift to distillates, use of novel deep desulphurization techniques, or fuel blending. Changes to the refinery processes can bring forth increases in greenhouse gas emissions and high capital investments. Alternative fuels will need to meet the required reduction of air pollutants and greenhouse gas emissions in coastal areas. Alternative marine fuels consisting of liquefied nature gas (LNG) and biofuel may be suitable fuels to meet both targets. These two fuels are predicted to account for 50% of shipping energy demand by 2050, while the remainder will still be supplied by conventional heavy fuel oil (HFO)/marine gas oil (MGO). Switching to low sulphur fuels as a results of the new IMO regulations has led to measureable reductions in ship emissions generally. This fuel switching also resulted in changes in engine emission characteristics, especially on particulate matter chemical composition. [ABSTRACT FROM AUTHOR]