The European Parliament recently voted that car ads must include warnings on vehicle CO2 emissions. If the rule successfully negotiates the rest of the European Union legislative process, 20 percent of a car ad would have to warn or educate consumers about the CO2 emitted from the vehicles advertised, as well as their fuel consumption. The 20 percent rule would apply to overall space in a print or internet ad and overall ad time for TV and radio commercials. “As you can imagine, it is not something that we would be particularly happy about,” says a spokesperson for an auto industry trade group. Ad companies are also not thrilled since the rule could cut into the $8.6 billion a year that automakers in Western Europe spend on car ads.