https://www.reuters.com/article/ryanair-carbon/ryanair-commits-to-12-5-sustainable-fuel-by-2030-idUSL8N2ML835
Note that IAG have commited to 10%.
I figure this is a wise decision as the Emmission Trading system will be strengthened and those airlines with old gas guzzlers who can't afford to modernise their fleet or rely on flying 1st Class and Business travellers will suffer most.
Those who are packing the most passengers in to the most efficient planes will flourish.
It will also hopefully silence some of the self-righteous who squawk whenever travelling by airplane for leisure is mentioned.