Mobile billboards are still something of an oddity here in North Dakota, but in other parts of the country they’re pretty common.  Basically, what they are is just a billboard attached to the back of a big truck of van which then drives around through major traffic areas so that pedestrians and other drivers see the ads.  They look something like this:

They seem like a fairly innovative way to advertise, but you wouldn’t think they’d be something the Sierra Club would be interested in.  After all, those trucks burn quite a bit of gas which in turn puts a lot of air pollution into the air.  Certainly the Sierra Club wouldn’t be compromising their environmental beliefs just for the sake of an effective ad campaign, would they?

/sarcasm

Honestly, this is about as funny as the time the Sierra Club sent a big, fat SUV to escort Arianna “SUV’s SUPPORT THE TERRORISTS!!!” Huffington to and from one of their conventions.