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Now imagine the same concept applied to a 1,000-square-meter kite, flying 300 meters above the water – only instead of towing a surfer across the waves, it’s helping to propel a colossal cargo ship across the ocean.

That’s the basic idea behind the Seawing, a technology being developed by French company Airseas, which it says could help cargo ships reduce their fuel consumption, and cut their carbon emissions by an average of 20%.

Powered predominantly by fossil fuels, the shipping industry accounts for around 3% of global greenhouse gas emissions, according to the International Maritime Organization – which is why there’s an urgent need for change, says Airseas co-founder and CEO Vincent Bernatets.

Its flight is controlled by autopilot software that operates from a box beneath the kite, which is in turn attached to the ship by a 700-meter-long cable that provides power and sends data to and from the vessel.

For more than a year, a 250-square-meter version of the Seawing has been tested on a cargo ship chartered by Airbus (which owns a minority stake in Airseas), sailing across the Atlantic.

Dr. Richard Pemberton, a lecturer in Mechanical and Marine Engineering Design at the University of Plymouth, in the UK, believes that “there’s an absolutely no question that it’s technically possible” for the technology to work.He points out that German company SkySails developed and tested a similar kite-based propulsion system for ships more than a decade ago.

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