Meghan Hodges
Cruise ships have become an increasingly popular mode of holiday transport, with companies reinventing themselves to include more attractions and cater to a wider range of holidaymakers. However, the environmental impact of these floating resorts has come under scrutiny in recent years. From air pollution to water pollution, the cruise industry has been accused of causing significant harm to the environment, with critics pointing to the high levels of toxic emissions and waste discharged directly into the sea. With the industry predicted to be worth nearly 4% of the global holiday market by 2028, the environmental and social impact of this fast-growing industry is a cause for concern.
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What You'll Learn
Cruise ships emit harmful gases, contributing to air pollution
Cruise ships have been criticised for their contribution to air pollution. These large vessels consume millions of gallons of fuel annually, emitting fumes that contain harmful gases, such as nitrogen oxide and sulphur. The burning of heavy fuel oil, a type of dirty fossil fuel, leads to the release of these noxious gases, which have been linked to respiratory issues and the formation of acid rain. Cruise ships have been estimated to emit 43% more sulphur oxides than all 291 million cars in Europe in 2022.
The cruise industry has been described as under-regulated, with ships permitted to discharge wastewater and sewage into the sea, contributing to water pollution. In the United States, laws allow cruise ships to dump raw sewage into the ocean when beyond three miles from the shore. However, there are stricter regulations in Alaska, where companies must adhere to higher standards. The International Maritime Organization has mandated lower sulphur emissions, leading to the use of scrubbers or exhaust gas cleaning systems.
Scrubbers are designed to remove sulphur from engine exhaust by using seawater, but critics argue that this method simply shifts the pollution from air to water. There have been reports of foamy and oily discharges from scrubber systems, indicating that the toxic chemicals are being transferred into the seawater. The effectiveness of scrubbers in reducing air pollution is questionable, as they enable the use of cheaper, dirtier fuels. The regulation of scrubber discharges is challenging due to jurisdictional complexities and legislative loopholes.
The environmental impact of the cruise industry extends beyond air and water pollution. The ships produce vast amounts of waste, including sewage, greywater, and plastic waste. Additionally, they contribute to economic leakage, tax avoidance, and
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Cruise ships pollute the water
Cruise ships have been accused of polluting the water in a number of ways. Firstly, there is the issue of sewage and waste dumping. Cruise ships produce large amounts of sewage and waste, which is often released into the ocean, polluting the water and contaminating marine ecosystems. This includes greywater, sewage, hazardous wastes, and oily discharges.
Secondly, cruise ships have been criticised for their use of scrubbers, devices that are meant to clean emissions by using seawater to "scrub" sulfur from engine exhausts. However, critics argue that this process simply transfers the pollution from the air into the water, as the toxic chemicals dissolved in seawater are then discharged back into the ocean. This has been observed by independent monitors, who have reported foamy and oily discharges from scrubber systems used by many cruise ships.
The impact of cruise ships on water pollution is significant. In Alaska, for example, there have been concerns about the pollution of the state's waters by cruise ships, with environmental regulators calling for stronger regulations. The increase in the size and number of cruise ships has led to a corresponding increase in pollution, with larger ships producing more waste and consuming more fuel, leading to higher emissions and greater pollution of the waterways.
Some efforts have been made to address water pollution by cruise ships. For example, in Juneau, only a limited number of ships are permitted to release treated wastewater while docked or moving at a certain speed. Additionally, some cruise lines, such as Disney, have received high marks for water quality compliance by not utilizing scrubbers. However, overall, the cruise industry has been criticised for its lack of environmental regulations, with campaigners calling for tougher rules to reduce the impact of this fast-growing industry on the world's oceans, rivers, and waterways.
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Cruise ships produce waste
Cruise ships produce a large amount of waste, and this waste often ends up in the ocean. A large cruise ship with 3,000 passengers and crew is estimated to generate 210,000 US gallons of sewage, 1 million US gallons of greywater (wastewater from sinks, showers, and laundries), 130 US gallons of hazardous wastes, 8 tons of solid waste, and 25,000 US gallons of oily bilge water during a typical one-week voyage.
While it is illegal under US and international maritime law to dump certain types of waste, such as plastics, sewage, and food waste, directly into the ocean, many cruise ships have been caught doing so. Some companies have faced fines as a result of their illegal waste disposal methods. For example, in 2019, Royal Caribbean was fined $20 million for its illegal plastic disposal methods.
Cruise ships also emit large amounts of greenhouse gases and toxic air pollution. The diesel generators that power every part of the ship, from spas to restaurants, release carbon dioxide, sulfur oxides, nitrogen oxides, particulate matter, and other toxic pollutants into the air.
In addition to the direct environmental impact, the waste produced by cruise ships can also have indirect effects. The increased waste in the ocean adds to the problem of pollution and oxygen depletion in the waters, leading to the creation of "dead zones" with a lack of oxygen due to rampant algae growth, which can be toxic to marine life.
Despite the negative impact of cruise ships on the environment, the industry is predicted to grow, with larger ships being constructed and marketed to a wider range of demographics. Environmental campaigners are calling for tougher regulations to address the pollution caused by this expanding industry.
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Cruise ships burn heavy fuel oil
Cruise ships are a major source of pollution, both in the air and in the water. The cruise industry has been criticised for burning heavy fuel oil (HFO), which emits large amounts of CO2 and other pollutants that are harmful to humans and the environment, such as black carbon, sulfur, and nitrogen oxides. These emissions contribute to air pollution in port cities and negatively impact the natural environments that cruise ships visit.
HFO is a cheap and toxic fuel that has severe ecological consequences if it ends up in the sea. Oil spills can have devastating effects on marine life, as evidenced by images of oil-covered birds and beaches. Despite the availability of cleaner alternatives, such as marine diesel, some cruise lines continue to use HFO due to its low cost. This has led to widespread criticism from environmental groups and campaigners.
To comply with regulations mandating lower sulfur emissions, many cruise ships have installed exhaust gas cleaning systems, also known as "scrubbers". These devices use seawater to remove sulfur from the engine's exhaust before it is released into the atmosphere. While scrubbers help reduce air pollution, they have been controversial due to the way they dispose of the captured pollutants. Instead of properly treating and disposing of the toxic chemicals, some cruise ships have been accused of discharging them directly into the seawater, causing water pollution.
The use of scrubbers allows cruise ships to continue burning HFO, as the scrubbers can remove the sulfur emissions that would otherwise be released into the air. This has led to a complex regulatory situation, with state and federal authorities struggling to effectively curb emissions and water pollution from scrubbers. While the International Maritime Organization (IMO) has implemented rules to reduce sulfur emissions, such as the IMO 2020 rule, the responsibility for regulating and enforcing these standards falls on various national jurisdictions, creating a challenging regulatory landscape.
The environmental impact of the cruise industry extends beyond air and water pollution. The carbon emissions associated with cruise ship vacations are roughly double that of equivalent flights plus hotel stays. With the industry expanding and larger ships being introduced, the environmental footprint of cruising is expected to grow. As a result, environmental campaigners are calling for stricter regulations and a transition to cleaner fuels, such as marine diesel or electricity-based alternatives, to mitigate the industry's impact on the planet.
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Cruise ships emit sulphur, contributing to acid rain
Cruise ships emit large amounts of sulphur oxides (SOx) or sulphur dioxide, contributing to air pollution and acid rain. Sulphur dioxide is a key component of acid rain, which causes respiratory and cardiovascular problems. In 2022, Europe's 218 cruise ships emitted as much SOx as 1 billion cars. In comparison, cruise ships in Barcelona emitted almost three times more SOx than all the cars in the city. The Mediterranean bears the brunt of this pollution, with Italy surpassing Spain as the most cruise ship-polluted country in Europe.
The use of scrubbers, or exhaust gas cleaning systems, has been a controversial topic in reducing sulphur emissions from cruise ships. While scrubbers are intended to remove toxic chemicals from ship exhaust by dissolving them into seawater, critics argue that they simply transfer the pollution from the air to the water. In addition, scrubbers allow ships to burn cheaper, dirtier fuels, which can have negative environmental consequences.
To reduce air pollution and their environmental impact, some cruise operators are investing in liquefied natural gas (LNG) and shore power. LNG is seen as a cleaner alternative, but it is not without its drawbacks, as LNG-powered ships can leak methane, a potent greenhouse gas. Shore power allows ships to turn off their diesel engines and run on electricity while docked at port, reducing fuel consumption and carbon emissions. Despite these efforts, the cruise industry still faces challenges due to its high carbon emissions, sulphur oxide releases, and other pollutants that harm air quality and contribute to acid rain.
The sustainability of cruise ships is a topic of debate among environmentalists, industry stakeholders, and tourists due to their multifaceted impact on the planet and communities. While some cruise companies are making efforts to reduce their environmental footprint, the industry as a whole continues to face scrutiny for its carbon emissions, waste generation, and impact on marine ecosystems. As the industry grows and larger ships are introduced, the environmental and social impact of the cruise industry will require global action and tougher regulations to mitigate the harm caused by these floating resorts.
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Frequently asked questions
Yes, cruise ships pollute the water. They are responsible for a vast quantity of waste discharged directly into the sea. They also use scrubbers to clean their emissions, but these devices have been criticised for polluting the water instead.
Yes, cruise ships emit harmful gases that contribute to air pollution and global warming. They also produce high levels of toxic air pollution in the ports where they are docked.
Scrubbers, or exhaust gas cleaning systems, are devices that use seawater to "scrub" sulfur from a ship's engine exhaust. They are meant to reduce the amount of sulfur emissions in the atmosphere, as these emissions are harmful to human health and a major driver of acid rain.
Environmental campaigners are calling for tougher regulations on the cruise ship industry. Some cities, such as Venice, Italy, and Barcelona, have moved to limit large cruise ships. In addition, some cruise lines, such as Disney and Ponant, have taken steps to improve their water quality compliance and offset their carbon emissions.
