A rocket launch consumes a few hundred tons of fuel. Roughly speaking, the equivalent of 1 million liters of petrol. All the better that ESA wants to send its Ariane launch vehicles into space using solar energy in future.https://www.notebookcheck.net/Space-travel-with-renewable-energy-ESA-launches-fuel-production-with-green-hydrogen.786902.0.html
"The fuel obtained from water is to be made available locally from 2026"
Since when water is a renewable resource.
ESA should first have a working rocket...