[cogitator]

Unlike the idiotic Kyoto Protocol, the Montreal Protocol addressed an important issue, and (somewhat amazingly) it's working.

[DrDavid]

Is this really working? Freon (carbon tetra-cloride) is about 10% more efficient than the best of the replacements. This requires more energy from the engine or electricity to power the air conditioner/refrigerator. DuPont owns the patents to all the replacements. The chemistry of the replacement doesn't seem any less likely to interact harmfully with ozone. However, the theory of how freon interacts with ozone (1995 Nobel Prize in Chemistry) has not been verified experimentally.

What have we gained?

[expatpat]

Not out of my taxes, I hope. Please....

[nightdriver]

"Halons are primarily used in fire extinguishers. Together with other chemicals, they destroy ozone molecules in the stratosphere that protect all living things from ultra-violet (UV) radiation."

This has never been proven.