A Bio-Bus which runs entirely on gas generated by human and food waste has carried its first passengers.
It is being used to provide a shuttle service between Bristol Airport and Bath city centre.
Engineers believe Bio-Bus could provide a sustainable way of fueling public transport while improving urban air quality.
The gas, biomethane, produces fewer emissions than traditional diesel engines and is both renewable and sustainable.
This week, the company also became the first in the UK to inject gas generated from human and food waste into the national gas grid network.
The annual waste generated from one bus load of passengers would provide enough power for a return journey from Land's End to John O'Groats.
Adapted from sky.com