Autocar is reporting that the European Parlaiment will consider a proposal this fall to ban all cars capable of reaching speeds over 101 mph. The proposal can be traced back to a man named Chris Davies, a Liberal Democrat Member of the European Parlaiment for the North West of England. Davies argues (try not to laugh while reading his words) that "between 1994 and 2004 the power of new cars went up by 28 per cent, making them a lot heavier, and so increasing the amount of CO2 they put out, even though no country raised its speed limit to allow cars to use this increased power."
The logic is so flawed here, we don't know where to begin. According to Davies, giving a car more power makes it heavier, thus increasing the amount of CO2 it emits. First of all, cars are heavier these days primarily because most developed nations, Europe and the United States included, have federally mandated that cars be made safer, and to achieve this, manufacturers have had to design new safety systems that add weight to cars. Things like airbags, crumple zones, side-impact bars, and the like are the primary reason cars have gotten heavier. While enlarging the displacement of an engine, switching from four to six cylinders or adding a supercharger could make a car heavier while giving it more oomph, more power for its own sake is neither a necessary nor sufficient condition for a car gaining weight.