Time to stop picking on aviation as some sort of bogie man
Indeed so, I remember an article in the London FT last year that said that the cruise ships owned by the Carnival Corp (brands such as Cunard, P&O, Holland-America, Costa and others) emit
10 times more sulphur-dioxide pollution than
all of the passenger cars in the whole of Europe!
Cruise ships in port continue to run their heavy-oil burning engines to generate power in the vast majority of cases. This is a big issue in places like Southampton (the UK's biggest cruise port) where there are increasing calls for technology to be developed to enable them to plug into "shore" power when docked.