Your question is years ahead.

So far no strict GW standard applies to car manufacturer except maybe for Europe and California (future 120 and then 100g CO2/km in Europe).
In most countries, the regulation is essentially due to health concerns (CO, SOx, NOx emissions) or in order to conserve energy.

In this regard, US car manufacturer have a dangerous market positionning since they are in GW vulnerable segments (large inefficient cars). They lose generally business due to their fuel inefficiency and lack of inovation. Their only resort to sell is to call on patriotism which is a bad sign.

Manufacturers of small and efficient cars (German Japanese, French and Koreans) have definitely a brighter future.
This is especially the case since their TDI and hybrid technologies are compliant with CO2 reductions

Even Chinese cars are much more efficient than US brands.

That would be General Motors ..... and Ford.
General Motors just lost their number 1 spot to Toyota.
Poor baby..... boo hoo

Gm Ford and Damleir Chrysler. any company that banked it's future on big SUV's it takes years to develope a vehicle to full production, usually 5 year lead time unless it's just a rework. so their all scrambling now for their next cash cow, which is also why your seeing mass lay-offs

Yugo