Now that the middle of summer is here, everyone that has car ac is thankful. But there are plenty of politics behind it.....mainly patents and patent expirations.
R12.....R134a.....R1234YF
the 3 refrigerants
Patents are or were held by Dupont and Honeywell. As the expiration of a patent date came closer, a requirement for a new refrigerant was put into law....not to mention at sky high prices for the new refrigerant.
Compared to the gasoline burned each day, and industrial processes, leakage from car ac systems is miniscule.
Also it is worth noting the latest refrigerant is flammable.....not so the previous ones.