Right but he’s not serious, he’s just doing a “in theory, what would it look like?”

To add; I’d imagine decomposition of compost further contributes to CO2. The fact that CO2 is pumped in to some commercial greenhouses suggests CO2 is a limiting factor in plant growth, but I wonder whether hydroponic systems - lacking soil and hence decomposition - require more.

Nice bit of work! Good that they supplied the supplemental videos, bit funny that they’re videos of videos.

Danish. It says Danish in the title. Why are people talking about the Dutch?

It says it right in the title. Multiple comments mentioning the Dutch. There’s some quite ignorant people commenting here.

I doubt this, but direct to Cologne would be good. It’s a route that eurostar currently offer, just with a change in Brussels, which can sometime be about 1.5 hours. Idk if passport control is feasible in Cologne, though. If so, 4hrs between London and Cologne is v. competitive with air.

It’s complicated with the passport control - it means the Cologne-Brussels bit is basically unusable as a journey in itself (ie people wanting to travel just that leg), so what I see happening is more something akin to what happened to the London-Amsterdam route when Amsterdam centraal was out of action regards passport control: on the return, everyone gets off in Brussels, schleps thorough passport control, and back on for Brussels-London. On the way out (London-Cologne), it’s can run direct, as everyone can just stay on the whole way, and non-passport-control passengers can get on for Brussels-Cologne, as at that point it’s just another train.