There are reports all over the internet that Italian carmaker Fiat is ready to pull out of ACEA because its interested aren't being represented by the European car lobby group.

It's been more of a surprise that Fiat has stayed with ACEA for so long than that they might walk now. When it comes to meeting CO2 emissions targets, small car makers like Fiat are streets ahead of producers of bigger cars. But somehow, the might of heavyweight German makers has won out time after time.

The proposals make it easier for bigger cars to make the grade, by basing targets on the weight of the car - basically, heavier cars get more lenient targets, so the makers of bigger cars have to do proportionally less to meet the targets. That means makers of lighter cars will actually have to do more to meet the targets, even though they already have lower emission rates. What kind of logic is that?

So when the CO2 emissions are taken as a whole across the industry, makers like Fiat are bearing the brunt.

At this late stage, with the legislation entering its final discussions before it becomes law, it's hard to imagine what ACEA can do to pacify Fiat and ensure that the interests of all European car makers are protected.

But don't worry, Greenpeace has a few ideas that ACEA might want to consider:

• Dropping the push for a phase in of the targets would help.
• Stop lobbying against a 2020 target. 80g/km would keep the pressure on the German car makers, and help the planet out to the tune of 121 million tons of CO2.
• And while they're at it, ACEA could stop arguing against strong penalties that would make it more cost effective for the manufacturers to comply than cough up the amount of the fine.