I used to fly a lot. Now I am limiting my flying. I use train for all domestic travel in Sweden. The challenge is to go to e.g. Germany with senior colleagues where it is often decided (based on time constraints and price) that we are flying to a conference. Intra-EU travelling by train is not developed enough and it is not socially accepted to spend a whole day extra for travelling when there is a morning flight. Although mental preparation of presentations etc. are helped by that slightly slower train ride.