> if it's a good idea to tax air travel inside the EU to help the trains move forward It’s rarely a good idea to look at a proxy instead of the real kpi you wa

> if it's a good idea to tax air travel inside the EU to help the trains move forward It’s rarely a good idea to look at a proxy instead of the real kpi you want to optimize. Don’t tax air travel. Tax CO2 emission of the fuel if that is what you want to reduce.