Environmental groups have urged Brussels to block a German CO2 labelling plan that will rate some of the largest gas-guzzlers as just as green as tiny town cars.
A plan being voted on in the German upper house, calculated to favour hefty German off-roaders and limousines, works out a car's green rating in relation to its weight.
The maths means that, instead of being marked down in the compulsory showroom labelling, big high-emissions vehicles would emerge with flying colours.
Green transport lobby group Transport & Environment used the sums to show that, if the legislation goes through in a vote in Berlin on Friday, a Smart car with CO2 emissions of 103g per km would be in the same "green" category as a Panzer tank, which emits 5,850 grams of CO2 per km.
The levelling factor is the relative weight - the Smart at just 750kg, and the tank at 62,000kg. For its weight, therefore, the Panzer tank is deemed worthy of a "green" badge
I'm going green in that case!