Regan Brown
The international shipping industry is one of the world's largest contributors to air pollution, burning over 300 million tons of fossil fuels annually, which is roughly 5% of global oil production. Fossil fuels are favoured by the shipping industry due to the high energy density of oil-based fuels, the lack of viable alternative energy sources, and the optimisation of cargo ships for the use of fossil fuels. As a result, the shipping industry emitted roughly 1 billion tons of carbon dioxide in 2018, accounting for about 3% of total global anthropogenic CO2 emissions.
| Characteristics | Values |
|---|---|
| Total fossil fuel consumption by cargo ships | More than 300 million tons of fossil fuels every year |
| Fossil fuel consumption as a percentage of global oil production | 5% |
| CO2 emissions from cargo ships in 2018 | 1.05 billion tons, accounting for 2.9% of total global anthropogenic CO2 emissions |
| Cargo ship speed and fuel consumption | Cruising speed of 24 knots consumes 225 tons of bunker fuel per day; at 21 knots, consumption drops to 150 tons per day, a 33% decline |
| Slow steaming speed | 18-20 knots |
| Extra slow steaming speed | 15-18 knots |
| Percentage of maritime trade consisting of fossil fuels and derived chemicals | 40% |
| Fossil fuel cargo in 2018 | 4,500 million tons out of 11,000 million tons of total maritime shipping |
| Global fleet fuel consumption in 2023 | A slight decrease compared to previous years |
| Global fleet fuel type in 2023 | Almost exclusively fossil fuels |
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What You'll Learn
Fossil fuel inefficiency
The inefficiency of fossil fuels in cargo ships is evident in their fuel consumption and emissions. The world's largest ship can consume more than 300 tons of fuel per day, and a typical containership can burn around 150-225 tons of bunker fuel daily, depending on its size and speed. This fuel consumption results in substantial carbon dioxide and sulfur dioxide emissions, with the shipping industry emitting approximately 1 billion tons of carbon dioxide annually. The emissions from the five largest ships alone produce as much sulfur dioxide as 750 million cars, highlighting the inefficiency and environmental impact of fossil fuel usage.
Furthermore, the cargo carried by these ships contributes to the inefficiency of fossil fuel usage. Approximately 40% of maritime trade consists of fossil fuels or chemicals derived from them. This includes coal, oil, gas, and petrochemicals, which are being transported for burning or further processing. The process of extracting, refining, and transporting these fossil fuels requires additional fossil fuel consumption, exacerbating the inefficiency.
While alternatives such as solar panels, sails, and hydrogen fuel have been proposed, they come with their own set of challenges. Solar panels and sails may not provide sufficient power for large ships, and hydrogen fuel production can also generate carbon dioxide emissions, depending on the production method. As a result, the shipping industry continues to rely predominantly on fossil fuels, despite their inefficiencies and environmental impact.
To improve efficiency and reduce environmental harm, the shipping industry is exploring more sustainable options. Slow steaming, for instance, has been adopted to reduce fuel consumption by lowering cruising speeds. Additionally, there are a few cargo ships that are currently experimenting with sails in addition to their fossil fuel engines. These measures aim to decrease the industry's reliance on fossil fuels and pave the way for more sustainable practices in the future.
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Cargo ships' emissions
The shipping industry is one of the world's dirtiest, with emissions exceeding those of highly industrialized countries. The industry uses over 300 million tons of fossil fuels annually, accounting for roughly 5% of global oil production. In 2018, global shipping emitted approximately 1.05 billion tons of CO2, contributing to about 2.9% of total anthropogenic CO2 emissions.
Cargo ships burn large amounts of fuel, with fuel consumption depending on ship size and speed. For example, a large container ship can consume about 225 tons of bunker fuel per day at 24 knots, but this drops to 150 tons per day at 21 knots, a 33% reduction. To cut costs in a high fossil fuel price environment, some shipping companies adopt slow steaming, reducing speed to cut fuel consumption despite extending travel time.
Cargo ships also contribute to emissions by transporting fossil fuels and fossil fuel-derived products, with 40% of maritime trade consisting of these goods. This includes the transport of crude oil, natural gas, coal, and petrochemicals.
The inefficiency of fossil fuels in the shipping industry has prompted exploration of alternative fuels, such as hydrogen, lithium-ion batteries, and biofuels. However, these alternatives face challenges, such as low energy density in the case of hydrogen, or high costs associated with nuclear power. Solar panels and sails have also been suggested, but they cannot generate sufficient power for large commercial cargo ships.
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Alternative fuels
The shipping industry uses over 300 million tons of fossil fuels annually, accounting for about 5% of global oil production. In 2018, the industry emitted roughly 1.05 billion tons of carbon dioxide, making up about 2.9% of global anthropogenic CO2 emissions. As a result, the industry is actively seeking alternative fuels and technologies to reduce emissions and environmental impact.
One of the most promising alternative fuels is liquefied natural gas (LNG), which has already overcome the challenges of international legislation. LNG currently accounts for about 24% of the overall gas market, and its usage is expected to increase due to its low emissions and availability.
Methanol is another viable alternative fuel that can be produced from a wide range of feedstocks and used directly or blended with conventional fossil fuels. It has close to zero emissions and is particularly beneficial for smaller vessels.
Biofuels are also gaining traction as they can be produced from biomass or biomass residues, offering a more sustainable and renewable option for the industry.
Hydrogen is considered a clean fuel when produced with renewable energy, and it is a leading candidate for zero-emission large-scale shipping. However, its low energy density requires larger storage volumes, which may impact ship design and cargo capacity.
Other alternative fuels and technologies being explored include ammonia, electricity, battery systems, fuel cells, and wind-assisted propulsion. While these alternatives show promise, they also face challenges such as scalability, infrastructure requirements, and cost.
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Ship speed and fuel consumption
The fuel consumption of cargo ships is largely dependent on their size and speed. While slower speeds can reduce fuel consumption, this is often not a viable option for shipping companies due to the longer shipping times and the need to assign more ships to maintain the same port call frequency.
The optimal cruising speed for most container ships is around 24 knots, which is considered the normal speed class, ranging from 20-25 knots. At this speed, a container ship can consume about 225 tons of bunker fuel per day. However, by reducing the speed to 21 knots, fuel consumption can be significantly reduced to around 150 tons per day, representing a 33% decline.
Slow steaming, with speeds ranging from 18-20 knots, is another option that shipping companies may consider to save fuel. This involves running ship engines below capacity, resulting in lower fuel consumption. However, it comes at the cost of extended travel times, especially over long distances. As of 2011, more than 50% of the global container shipping capacity was already operating under slow steaming conditions.
Extra slow steaming, or super slow steaming, refers to speeds between 15-18 knots. This strategy is employed to achieve minimal fuel consumption levels while still maintaining a commercially acceptable service. However, even at these slower speeds, there is a limit below which the level of service becomes unacceptable, and shipping companies are unlikely to adopt such low speeds.
While alternatives such as solar panels, sails, or hydrogen fuel have been suggested, they may not be feasible for large cargo ships due to the amount of power required. Nuclear power is another option, but the high cost of building and maintaining nuclear reactors makes it less economically viable than fossil fuels. As a result, the shipping industry continues to rely heavily on fossil fuels, contributing significantly to global carbon emissions.
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Fossil fuel cargo
The shipping industry is one of the world's largest consumers of fossil fuels. In 2018, the industry emitted roughly 1.05 billion tons of carbon dioxide into the atmosphere, accounting for about 2.9% of total global anthropogenic CO2 emissions. According to Camille Bourgeon, a specialist in air pollution and energy efficiency, the industry "uses more than 300 million tons of fossil fuels every year, roughly 5% of global oil production". The largest ship in the world consumes more than 300 tons of fuel per day.
The amount of fuel consumed by a cargo ship depends on its size and cruising speed. For example, a containership of around 8,000 TEU would consume about 225 tons of bunker fuel per day at 24 knots. At 21 knots, this consumption drops to about 150 tons per day, a 33% decline. While slower speeds can reduce fuel consumption, this is often not a viable option for shipping companies as it results in longer shipping times and the need for more ships to maintain the same port call frequency.
The high fuel consumption of cargo ships has led to concerns about their environmental impact. About 40% of maritime trade consists of fossil fuels or chemicals derived from them. This means that the shipping industry not only contributes to carbon emissions through fuel consumption but also through the transportation of fossil fuels.
There have been efforts to explore alternative fuels and technologies to reduce the reliance on fossil fuels. Hydrogen, for example, has been proposed as a potential clean fuel. However, the current production methods for hydrogen often involve the use of natural gas or other fossil fuels, generating significant CO2 emissions. Other alternatives, such as nuclear power, are expensive to implement. As a result, the shipping industry continues to rely predominantly on fossil fuels, with the global fleet using almost exclusively fossil fuels as recently as 2023.
While modern cargo ships use fossil fuels, there is a growing trend towards exploring more sustainable options. Some ships have adopted sails in addition to their fossil fuel engines, and there are also demonstration ships powered by non-traditional energy sources, such as the Yara Birkeland, a Norwegian ship powered by lithium-ion batteries. As the push for greener alternatives gains momentum, the industry is expected to further explore and adopt more sustainable practices to reduce its environmental footprint.
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Frequently asked questions
The shipping industry uses more than 300 million tons of fossil fuels annually, which is approximately 5% of global oil production.
Fossil fuels are still used by cargo ships because alternative fuels are not yet efficient enough to power these ships. While solar panels and sails are options, they cannot generate sufficient power for large cargo ships.
Hydrogen is a leading candidate for a zero-emission fuel for cargo ships in the future. However, the way hydrogen fuel is produced greatly impacts its eco-friendliness. Other alternatives include nuclear energy and lithium-ion batteries.
The fuel consumption of a cargo ship is a function of its size and cruising speed. While slower speeds can reduce fuel consumption, this advantage is mitigated by longer shipping times. Therefore, most cargo ships travel at normal or slow steaming speeds to balance fuel efficiency and commercial service.
Approximately 40% of maritime trade consists of fossil fuels or chemicals derived from them. This includes coal, oil, gas, and petrochemicals.
