Paris and Berlin are now linked with an 8 hour daily rail service, that starts at €59. It produces 100th of the emissions of flying between the cities.
https://www.euronews.com/travel/2024/12/13/high-speed-train-from-paris-to-berlin-to-launch-this-winter-with-daily-connections-from-59
High-speed Paris-Berlin daily train service debuts

The route is the first directly linking the two capitals' city centres.

euronews
@ExtinctionR And guys, Frankfurt-Paris by train is a hair under 4 hours, which is more or less exactly what it takes to fly when you figure in get-out-to-airport-go-through-security-stand-around-waiting-to-board-fly-get-your-bags-get-into-town-from-airport time. Cheaper, far fewer emissions, roomier and more comfortable AND you step in at Frankfurt HBf and out at the Gare du feckin’ Est! What’s not to love???