It has virtually nothing to do with emissions (as if it did, they would just hook up a sniffer to test and be fine)- instead there are blanket bands on any modification not from Edelbrock or s couple others unless those companies pay exorbitant fees to be “CARB-approved” which has snuffed out innovation from smaller machine shops. And the loopholes are what has driven cars to be bigger and not more fuel efficient
It means a slowed increase in temperature which means safety for coastal areas, a slowed increase in extreme weather events - there are a lot of proposals out there and studies on their effect. You just seen to want to say fuck it, I don’t want to change or pay slightly more for energy or change your actions.