Experimental system powers auto AC using exhaust

It wouldn't be Earth Day if we didn't find at least one crazy wacky intriguing idea to use technology to reduce pollution. This one comes from an Australian PhD student who has apparently come up with a way to convert the heat generated by auto exhausts to energy that can be used to power a car's air conditioning.
Yeah, the idea of piping exhaust into the interior of a car doesn't seem like a great idea to us either, but the student, Luke Zoontjens, claims that his system runs the exhaust through a series of sealed metal tubes, creating high-amplitude sound waves that can generate cold spots. A lot of hot air? Sound and fury signifying nothing? Ah,
nevermind. We'll just wait to see how long it takes any automaker to look at this.