Did some more reading and this whole carbon footprint thing is ill thought out.
Seems GM has it in its mind that recycling is the best way to reduce its carbon footprint, and that if its can recycle the same amount it burns in energy then it would become carbon neutral (sounds good so far).
So what does it claim to recycle? "its old unsold inventory" E.G. its unsold spares and vehicles are recycled (e.g sold off to the scrap man) and last year they managed to recycle 80,000 tonnes, and can offset this against their carbon footprint.
Maybe someone should ask why the hell they made 80,000 tones of scrap in the first place!!!
Talk about spin to hide bad management