I have been thinking an active tax policy should be used to discourage any increase in fossil fuel consumption. Say, if the EU imports 3% more fossil fuels one year than the next, slap on a 3% increse in tax. This could be done on a fuel-by-fuel basis. So, if aviation fuel is the fastest growing fuel (just for the sake of argument) it would see the largest tax increase year-on-year. This tax should go to the EU directly, not the member states, and be earmarked for non-fossil-fuel transportation R+D and infrastructure.

But this is part of a broader transportation energy policy and beyond the scope of this consultation.

Nothing is 'mere'. — Richard P. Feynman