This guerilla campaign is from BUND, the German Friends of the Earth. They want consistent ecological politics. At this campaign members of the BUND put globe-ballons on exhaust-pipes of cars in Berlin. The emissions inflate the ballons. And after the message (The world can't take anymore CO2.) is readable, there is a big bang. Of course the text is not always readable anymore after the big bang but the campaign gives a lot of rumour and media attention.
Agency: BUTTER Berlin, Germany.