I'd argue that the intelligent regulation would be to mandate some sort of cooling based on internal temperature differential. Once passenger compartment gets to be some percentage hotter than the outside air, the cooling mechanism kicks in to bring the internal temp to parity with the external temp.
1) Instead of mandating which technology to use, you are mandating results. The free market (and the engineers that work in them) will eventually figure out the best solution. (I think a little exhaust fan that runs off the battery would do it, although you can already get the Toyota Prius with a $3,000 option to add solar cells to the roof to run the fan and charge the battery).
2) Has to potential to stop heat death from infants / animals left in sealed passenger compartments.
3) The idea that glass will keep the car cool is only good for a very small percentage of trips. That it is enough to matter is a stupid idea.
Seriously: how much heat had to build up that you are wasting a significant amount of gasoline to cool the car down?
That is a rhetorical question, as I live in California's Central Valley. It gets so hot here, that jokes are: "You know you're from Fresno when people with black cars or upholstery are assumed to be from out-of-town." "You know you're from Fresno when you think someone driving wearing oven mitts is clever." "You know you're from Fresno when you discover, in July, it only takes two fingers to drive your car." "You know you're from Fresno when the best parking place is determined by shade instead of distance." "You know you're from Fresno when you can say 115 degrees without fainting." (There are many more, though they probably pertain as well to Phoenix as to Fresno).
Anyway - yes, I've driven the car when it is OMG hot, and the airco had to work far longer to cool down the car. On a normal hot day, the car takes 5 - 10 minutes to cool down. On the OMG hot days, it takes 15 - 30 minutes to cool down.
A) The OMG hot days only happen 20 days a year (about 5%).
B) The OMG hot car happens when you leave your car out in the sun ALL DAY. While at work, or you aren't smart enough to put the car in the garage, whatever - the car has to sit in the hot sun for HOURS to get so hot that the airco has the heat overload problem.
This glass isn't some magic that reverses the laws of thermodynamics. If you leave the car out in the sun for HOURS, it is still going to get OMFG hot. It may take longer with the new glass, but it will still happen.
So the real case for this 'solution' only solves the problem where the car was first cool AND THEN goes out into the OMG heat (5% of the days) AND THEN only stays in the heat a short enough time that the delaying factor of the new glass matters.
Way to swat a fly with a sledgehammer CARB. You are a bunch of dolts on a power trip.