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2025 Environmental Technologies and Practices Report by CLIA

The Cruise Lines International Association (CLIA), a leading organization in the global cruise sector, has recently published its annual Environmental Technologies and Practices (ETP) report. This comprehensive document, which covers data from 2018 to 2024, highlights significant advancements in environmental efficiency among CLIA-member cruise lines. Notably, these member lines represent over 90% of the cruise industry.

Key Findings of the Report

The 2025 report illustrates ongoing and measurable advancements as cruise lines work towards an extensive environmental agenda. Highlights include:

1. Progress in Alternative Fuels: The use of biofuels, lower emission fuels, and highly efficient engines has increased. These technologies not only aid in reducing emissions but also boost operational efficiency.

2. Fleet Overview: As of August 2025, CLIA consists of 45 cruise lines operating a total of 310 ships, showing a modest increase compared to previous years. The cruise line fleet primarily consists of small to mid-size vessels, which continue to dominate the market.

3. Commitment to Net-Zero Emissions: CLIA-member cruise lines are committed to achieving net-zero emissions by 2050. They are currently investing in multi-fuel engines that can adapt to zero- and near-zero emission fuels as they become prevalent.

4. Onshore Power Supply (OPS) Capabilities: The report indicates a substantial rise in the integration of shoreside electricity in cruise ships, allowing vessels to power down while at port, which can reduce emissions by up to 98% depending on the energy mix used. The number of ships utilizing OPS has nearly doubled since 2018.

5. Selective Catalytic Reduction (SCR) Technology: There has been an exceptional surge in the deployment of SCR systems among cruise lines, helping to lower nitrogen oxide emissions and align with global standards.

Technological Innovations

Bud Darr, President and CEO of CLIA, emphasized that cruise lines are at the forefront of maritime technological innovations. This includes:

• - Advanced Wastewater Systems (AWTS): Over 80% of the CLIA-member fleet is now equipped with AWTS that surpass international discharge standards. This shift ensures that untreated sewage is never released during operations.
• - Water Conservation Systems: With the majority of freshwater needs produced onboard, CLIA member ships have adopted advanced technology, including steam evaporation and reverse osmosis, which significantly reduces reliance on port water supplies. Currently, 279 ships are capable of producing their own fresh water.
• - Waste Management Systems: Innovations such as waste-to-energy gasification systems are on the rise, recycling or repurposing waste generated onboard. Many vessels are now capable of managing waste more efficiently, significantly lowering the volume sent to landfills.

Looking Ahead

The report paints an optimistic picture for the cruise industry, wherein continued investment and technological advancements are paving the way for a more sustainable future. The growing fleet of new ships, combined with the acceleration of green technologies, highlights the cruise lines' commitment to sustainability and environmental stewardship. As the industry moves forward, it is clear that adopting these innovations will be vital in achieving the common goal of net-zero emissions and reducing environmental impact.

In conclusion, CLIA’s annual report serves as a reminder of the proactive steps being taken by cruise lines to ensure a greener cruising experience. With billions of dollars invested in future fleets, the cruise industry is setting a benchmark for sustainability within the maritime sector.