Sono entrati in servizio, e per il momento si limitano a precorrere il tragitto tra il centro della città di Bath e l'aeroporto di Bristol, gli autobus funzionanti a biometano, gas ricavato dal trattamento di escrementi e rifiuti alimentari. Si calcola che per fare il pieno, che garantisce un'autonomia di 300 chilometri, servano i rifiuti organici prodotti da cinque persone nell'arco di un anno.
Impianti per ricavare gas dal liquame
ANSA/dg
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