Activist organization Friends of the Earth recently released a cruise ship report card, grading 16 cruise lines and 185 cruise ships on their environmental footprint. The report card grades cruise lines on sewage treatment technology, air pollution reduction, compliance with Alaskan water quality regulations and transparency.

The report card shows all seven cruise lines under the Carnival Corporation brand received a failing grade for what the organization calls “blatant illegal pollution.” The organization goes on to claim Carnival Corporation illegally dumps oily waste and plastic into the ocean and hides it from regulators.

“Carnival Corporation’s despicable behavior shows that we cannot take this polluting industry’s claims of environmental responsibility at face value,” said Marcie Keever, oceans and vessels program director, Friends of the Earth. “This entire industry must be investigated, and held accountable for its destructive behavior. Carnival Corporation should be forced to spend some of their massive profits to clean up the communities they have dumped on. This egregious case of wrongdoing shows just how critically we need federal agency and congressional oversight of cruise industry pollution practices.”

According to the EPA, cruise ships emit more sulfur dioxide than 13 million cars each day and produce approximately 21,000 gallons of sewage.

“While the cruise industry continues to make claims about pollution reduction, their behavior says otherwise,” added Keever. “Cruise lines are largely failing when it comes to air and water pollution reduction. Excess pollution from these ships can cause serious health problems, destroy habitats and exacerbate climate change. It is time for the industry to change their behavior in order to protect the oceans they are cruising on and the communities they travel to.”