"This technology is an accomplishment as well as an important milestone for our company," said Carnival Corporation CEO Arnold Donald. "Working together with the EPA, U.S. Coast Guard and Transport Canada, we have developed a breakthrough solution for cleaner air that will set a new course in environmental protection for years to come." Other initiatives include Carnival's goal to reduce greenhouse gas (GHG) emissions by 20 percent in 2015 from its baseline 2005 level. From 2005 to 2012, Carnival has reduced its emission rate by 16.7 percent, including a three percent decrease between 2011 and 2012. Carnival has installed water treatment plants on nearly half of its entire fleet of ships, and plans to install advanced versions of the treatment plants on new ship builds and will continually upgrade existing ones. It is Carnival's corporate policy to never discharge untreated sewage, despite maritime law allowing it in specific instances.