Cardiff Bus appears to be experimenting with a new, environmentally friendly*, way of generating some of the horse power required to move a bus.
https://www.bbc.co.uk/news/uk-wales-51146051
Whilst environmentally friendly in general it's unlikely to be friendly to the environment in the bus!
https://www.bbc.co.uk/news/uk-wales-51146051
Whilst environmentally friendly in general it's unlikely to be friendly to the environment in the bus!