This looks quite interesting!

The world’s first commercial cargo ship partially powered by a giant kite is setting sail from Germany to Venezuela.
The designers of the MS Beluga Skysails say the computer-controlled kite, measuring 160sq m (1,722sq ft), could cut fuel consumption by as much as 20%.

They also hope the state-of-the-art kite will help reduce carbon dioxide emissions, as it tugs the ship.

Fuel burnt by ships accounts for 4% of global CO2 emissions - twice as much as the aviation industry produces.