GREEN
09/07/2010 02:33 pm ET Updated May 25, 2011

'Poo-Powered' Vans Promote Sustainable Driving In UK

"Poo-powered" vans will soon be seen on the streets of Sheffield in an attempt by the city council to encourage sustainable motoring.

The six vans run on biogas generated from the raw sewage treatment process.

Read more on BBC News