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Royal Caribbean Cruises has announced it will retrofit 19 of its ships with advanced emissions purification (AEP) systems, also known as scrubbers, which will remove more than 97 percent of the sulfur dioxide emissions generated by the ships' diesel engines.

Carnival Corporation will spend $180 million to install scrubbers designed to reduce sulfur emissions on 32 ships. In return for installing the technology, the EPA will exempt the ships from its low-sulfur fuel mandate.