Earlier this year, Rolls-Royce and easyJet PLC conducted a world first test of a modern aero engine using hydrogen fuel. 

The test used a modified Rolls-Royce AE 2100-A regional jet engine powered by renewable energy.

The hydrogen fuel used in the test came from the European Marine Energy Centre (EMEC) in the Orkney Islands.

It was generated using renewable energy, and is known as green hydrogen. The fuel is a carbon-free.

The test used a modified AE 2100-A engine that originally powered Saab 2000 turboprops.

 It also has minor modifications that will need to be made to the fuel injectors.

In September, Rolls-Royce was awarded funding from the EU-backed Clean Aviation body.

 Its goal is to have zero carbon emissions from commercial aircraft by 2050.

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