And the changes in the size are due to fluctuations of the sun, and not CFC, or SUV's.
So, . . ah, can have our r12 back now (a perfectly safe & useful inert product, it's inventor breathed it in & blew out a candle with it half a century ago).
Nothing better has been or will be invented, 134a is an older more dangerous formula that doesn't even work as good.