Many car makers (Toyota, GM, Mitsubishi, Peugeot, Saab and Suzuki) have had phrases in ads called misleading by Norway. Toyota dared to call the Prius "the world's most environmentally friendly car." What's wrong with that? Norway says that can't be proven. You have to document all aspects of production then compare that to all other cars. "In practice that can't be done" says Oeverli, so they can't say it. There are fines if they do.
[Source: Treehugger via Reuters]