This is a great way to visualize gas emissions which are normally invisible. That's why most people don't have any real sense how much is produced by the things you do in everyday life like running your washing machine or refrigerator.

The black balloons really work, with the black color implying "bad" and they're actually filled with a lighter than air gas that rises into the atmosphere. I'm assuming that the size of the balloons actually represents the 50 grams of greenhouse gas discussed in the ad.

Found on infosthetics.com and radar.oreilly.com and the original is at www.saveenergy.vic.gov.au from the Australian government.