Boat disadvantages * Motion sickness * Viral outbreaks on boats, These viruses run rampant on cruise ships because of the large number of people in close proximity to one another for extended periods of time
Carbon dioxide emissions from shipping are double those of aviation and increasing at an alarming rate which will have a serious impact on global warming, according to research by the industry and European academics.
Aviation carbon dioxide emissions, estimated to be about 2% of the global total, have been at the forefront of the climate change debate because of the sharp increase in cheap flights, whereas shipping emissions have risen nearly as fast in the past 20 years but have been ignored by governments and environmental groups. Shipping is responsible for transporting 90% of world trade which has doubled in 25 years.
The use of alternative fuels
If such planes were just 10% more fuel efficient, the industry would save about $7 billion a year.