Publicizing Pollution With... Pollution

The World Wildlife Fund used this promotional vehicle (sorry) to publicize the effects of auto exhaust on the environment in China. The balloon inflates as the car idles. Apparently, the ballon represents the amount of carbon monoxide an average car releases in a day. Kind of cool how the total exhaust is being used to simulate the portion of the exhaust that is carbon monoxide... I'm sure there are interesting analogous visualizations. [Via|Link]