Global warming farce has,and will continue to kill great advances we as a society have made. Halon, freon oh,btw, even the newest refrigerants are under attack now. soon you can forget air-conditioning
Mate, firstly I will state that I am a "Global Warming" sceptic. That being said, a sceptic does not immediately dismiss what data/statement is being proposed but analyses the data
and the source of that data/statement.
As to the aerosols/chemicals that were depleting the ozone resulting in an atmospheric hole over the antarctic, I'm am glad that their use was stopped and that the hole continues to repair itself... because that hole directly effected me and all of the very southern hemispheric landmasses. The UV rays were, and still are for the most part, brutal down here. Even in the dead of Summer I will only wear long sleeve shirts and trousers + Acubra whilst outside... even when overcast.
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Halon as a fire retardant has its place in mankind's arsenal when used in specific situations. During my Navy days it was
the last resort Engine Room 'dump' for an out of control fire in that space. Anyone who was still in the ER was 'lost'.
AFFF is a great
blanketing agent. But you do have to know how much to use in any given situation... and that takes training. I believe that the Tassie Rural Fire Brigade is, for the second season, using a fire retardant foam to prevent flair-ups of bush fires. (we'll see what the Greenies have to grumble about later

)
Right now, for the domestic consumer, Dry Powder is the cheapest and most readily available portable extinguisher. Most automotive/hardware stores have them (even some supermarkets) and they are better than having nothing at all. Other types can be purchased from more specialised stores if you know what you're after.
Science marches on!