Carnival invests $400M on exhaust gas-cleaning technology for 70% of vessels Carnival announced plans to significantly increase installations of its industry-first exhaust gas cleaning technology to more than 70 vessels. The expansion covering over 70% of its entire fleet represents an increase from the 32 ships announced in September 2013. Carnival is investing as much as $400M to design, build and install the systems, being used for the first time in the restricted space found on cruise ships. The systems will enable Carnival to meet new regulations that place a cap on sulfur content of fuel oil at 0.1%, resulting in significantly reduced air emissions. The systems will help the company meet its environmental sustainability goals, as well as mitigate escalating fuel costs.