Staff Writer
Cruise vacations have become a hallmark of modern travel, offering opportunities to explore new destinations while enjoying luxury accommodations. However, the industry’s environmental footprint tells a starkly different story. A new report highlights the staggering pollution levels from the world’s largest cruise operators, revealing that the environmental toll of cruising far outweighs its perceived benefits.
Cruise Emissions Surpass Citywide Pollution Levels
A recent Transport and Environment (T&E) campaign group report unveiled that Carnival Corporation, the largest cruise operator globally, emitted more carbon pollution in 2023 than Glasgow, Scotland’s largest city. According to city council data, Carnival’s emissions reached an alarming 2.5 million tonnes (2.75 million tons) of carbon dioxide, surpassing Glasgow’s 2021 levels of 2.43 million tonnes (2.68 million tons).
Even more concerning, Carnival’s environmental impact isn’t limited to carbon emissions. A 2022 analysis found that Carnival’s fleet of 63 ships produced more sulfur oxide pollution than all the cars in Europe combined. Sulfur oxide is a major contributor to acid rain and respiratory problems, compounding the industry’s environmental cost.
Other leading cruise companies are similarly implicated. MSC Cruises ranked as the second-largest polluter, followed by Norwegian Cruise Line. Together, these three companies dominate the European cruise market, exacerbating air and marine pollution in the region.
Cruise Industry Emissions in Global Context
Travel accounts for approximately 8% of global carbon emissions, and while flying often garners the spotlight for its environmental impact, the emissions intensity of cruise ships far exceeds that of air travel. Studies show that cruise ships emit up to four times more carbon dioxide per passenger per mile than planes, making them one of the most polluting forms of transportation.
In addition to carbon dioxide, cruise ships release significant amounts of black carbon, a potent short-lived climate pollutant that accelerates Arctic ice melt when deposited on snow and ice. The Arctic Council estimates that shipping accounts for 5% of global black carbon emissions, with cruise ships being significant contributors.
Further compounding the problem is the use of heavy fuel oil (HFO), one of the dirtiest fossil fuels. Although many cruise lines have installed scrubbers to reduce sulfur dioxide emissions, these systems often transfer pollutants to the ocean. A Swedish study revealed that ships using scrubber technology in the Baltic Sea generated €680 million ($720 million) in socio-economic costs from 2014 to 2022 due to pollution’s impact on health and the environment.
Local and Global Action Against Cruise Ship Pollution
The environmental ramifications of cruising have prompted action at both local and international levels. In Europe, cities such as Venice and Amsterdam have imposed restrictions or outright bans on cruise ships due to their detrimental effects on air quality, marine ecosystems, and cultural landmarks. Similarly, cities in the United States, including those in Florida, Maine, California, and Alaska, advocate for stricter regulations or bans to curb pollution from cruise operations.
On a global scale, the International Maritime Organization (IMO) has set targets to reduce greenhouse gas emissions from shipping by 50% by 2050 compared to 2008 levels. However, critics argue that the IMO’s measures lack the urgency to address the climate crisis, especially as the cruise industry continues expanding.
Challenges in Transitioning to Sustainability
Although some cruise operators have pledged to adopt greener practices, progress has been slow. Investments in alternative fuels, such as liquefied natural gas (LNG), have been touted as a step forward, but these fuels still emit carbon dioxide and methane, a greenhouse gas far more potent than carbon. Additionally, many ships built with LNG capabilities continue to rely on HFO during parts of their journeys.
Industry leaders like Carnival and Royal Caribbean have announced plans to deploy zero-emission ships by the 2030s, but these remain prototypes, and commercial adoption could take decades. Meanwhile, smaller, boutique cruise companies are beginning to adopt hybrid or fully electric propulsion systems, providing a glimpse of a more sustainable future for cruising.
A Call for Accountability and Transparency
The question remains: is the industry willing to align with global climate goals? For travelers, understanding the hidden costs of their vacations is crucial. The environmental impact of a cruise is not confined to the open seas; it ripples through air quality, marine biodiversity, and the accelerating pace of climate change.