
The solar sail: super-yachts could cut fuel consumption and emissions by using a sail similar to this.
Super-yachts owned by billionaires like Chelsea Football Club owner Roman Abramovich and Microsoft co-founder Paul Allen are currently among the biggest fuel guzzlers on the planet.
Some of the ocean-going beasts like Sheikh Mohammed bin Rashid Al Maktoum's "Dubai," the biggest private super-yacht in the world, are over 150 meters long and contain amenities like aircraft hangars, movie theaters, Jacuzzis, and swimming pools.
Fuel consumption estimates on super-yachts have ranged up to one liter of fuel per second when traveling at high power.