A fart on a bus is a most unwelcome travelling companion. Although it is immensely funny if you cut one just before your stop. Anyway, here’s a bus powered by compressed natural gas, being a Gillig CNG. Emitting around 20% less CO2 than diesel equivalents, CNG buses run mostly on the same stuff that exits your body, with this one (the bus, not a fart) being formed by previous bloggee 1saac W. of Flickr. There’s more to see at 1saac’s photostream and can toot on over via the link above.