For at least the next decade, Carnival cruise ships are expected to continue to call Seattle its homeport for cruises to Alaska. Port of Seattle commissioners on June 25 approved a decade-long “preferential berthing agreement” through 2033 with Carnival Corporation, whose brands encompass the Carnival Cruise Line, Princess Cruises, Holland America Line and Cunard brands. “This long-term agreement provides economic certainty for the port and local businesses who depend upon cruise, while also strengthening our partnership,” port Executive Director Steve Metruck said. The agreement also includes a five-year optional extension and builds on sustainability efforts at the port and by…