This is indeed predictable. The fact that one fuel is taxed and another is not is called an economic distortion.
One of the factors allowing Ryanair and Easyjet to offer "ten quid" fares to hither and yon and apparently still make a profit is the lack of any tax on Jet fuel.
So the trumped up "efficiency" of LoCo air travel is actually just a reflection of the fact that they are not paying tax like everyone else.
Sorry guys, no sympathy, I guess its entirely predictable. The greenhouse stuff is just an excuse.
If you really want to scream, wait till carbon taxes bite on manufactured goods - aluminium is basically congealed electricity - usually produced by burning coal.