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The output of Erebus in HF and HCL alone was an average of 6 gigatons per year from 1976 to 1985, and 13.3 gigatons per year from 1986-1991.

I greatly appreciate your posting this info- I was a foot soldier in the "Freon Wars" of the 1990's- used to be an HVAC mechanic- and none of my old info is before me, but I recall volcanoes as being the great producer of halides.... not CFC's.

DuPont's patent on Freon ran out in 1996 ( I think! ) and they did their best to contribute to turning it into a "controlled substance." I have a little web based info on this here:

Scams, Scalawags, and an all-too-gullible Public...famous frauds sold to America

Excerpts:

The Freon Wars ( how a nearly-inert, benificent gas became Devil Vapor )

-Puron and Freon 12 are the Biggest Scams to Hit the American Public Since--

-Freon superstitions--

-Behind the Freon Frenzy--

-Freon Refrigerators from the late 1800s until 1929 used the toxic gases, ammonia (NH3), methyl chloride (CH3Cl), and sulfur dioxide (SO2),--

-Freon Replacements vs 134a - a highly opinionated look Hydrocarbon Refrigerant Hotline ...--

-Arrest that freon--

Nice set of Freon / ozone links. I was professional mechanical engineer in private practice, ASHRAE member, all that, until a career shift about 6 years ago. To sum it all up: Freon causes ozone depletion like guns cause crime.

The banning of CFC's has come at great societal cost. We took a huge step backwards in energy efficiency of air conditioning / refrigeration equipment as a result of the transition to the new refrigerants. Thank you, enviralmentalist whackos. < /sarcasm>

I still have a *big* tub of R-22 for my home systems.

That info on Erebus is hard to find, they hide it well, but if you know the University, New Mexico Tech in this case, doing the studies you can find it. Either on their sites or by doing some google searches and wading thru the cached data.

Here's some more facts for you warriors: At the height of man's CFC production the total per year was 1.2 million tons. Less than 500 million tons were produced over the years of production 1930-2000. The Oceans of the world produce 600 million tons of Clorine per year, this is not even equal to man's total CFC production.

Here's a challenge for you diggers:
Back in 1994 there was a bill in the House to investigate this fraud(HR-291, IIRC). I can't find a trace of it.

Most of the Freon demonizers claim that the lighter than air superheated gases (reactive halides) spewing out of volcanos combine with water vapor and fall back to the ground within 7 days, yet that Freon(an inert halocarbon) which is 6 times heavier than air at sea level, floats magically to the Stratosphere over the Southpole(against 200MPH+ winds) where it decomposes into HF and HCL and reacts with Ozone. The claim is that one atom of Clorine can destroy upto 10,000 Ozone molecules, but this too has never been proven.

Also, coincidentally(of course) to the ban, Dupont's international patent on Freon expired at the same time the ban went into effect.

If volcanos released CFC's the only ozone hole over the Southpole would be due to the lack of sunlight during the winter.