The balloon says: Drive one day less and look how much carbon dioxide you’ll keep out of the air we breathe.

While the Chinese economy is booming, the skies above its cities are blackening. China will actually pass the United States as the world’s biggest source of greenhouse gases this year.

The World Wildlife Federation started a campaign in China to raise awareness of the issue.  The photo is their way of helping people visualize the problem. On their site www.20to20.org, which is geared toward China, you can take an energy quiz and download 20 tips to reduce CO2 emissions.

Thanks to Newton Streets for finding this one.