On Sunday, it was revealed that, after a breakthrough at Oxford University, we could be close to seeing commercial airliners powered by ammonia instead of kerosene. The British technology would result in zero-emission aircraft, and airlines would be able to adapt their existing fleets rather than having to buy redesigned planes.

The Telegraph reported on Sunday that greener aircraft engine technology being developed in Oxford could mean emission-free air travel within a matter of years.

Reaction Engines is working on systems to adapt existing planes to run with zero emissions using ammonia as fuel instead of kerosene.