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Name: Kentner
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Question:
I am looking for some evidence that man has not significantly influenced the ozone layer, with the use of CFCnd carbon dioxide.



Replies:
First of all, carbon dioxide does not influence the ozone layer so you do not need any evidence for that. The only real evidence that CFCs are not hurting the ozone hole is that we did not measure Antarctic ozone until fairly recently so even though the "hole" has gotten worse, we have no clue what it was like before measurements. I am not sure that would hold up in court). There is evidence that ozone in the rest of the world is decreasing, but not as fast as people expected. -Again, a fairly weak argument. Many scientists feel that CFCs are guilty but you may find some that could give you contrary evidence.

Marc Fernau


We know that CFCs cause the destruction of ozone in the presence of sunlight, and we know that CFCs are produced by human industry, and we know that CFC concentrations in the upper atmosphere have risen while ozone concentrations have fallen. There is sufficient evidence to attribute some of the ozone depletion to human activity. However, there may be other chemical agents capable of depleting ozone that come from natural processes, which could add to the rate of depletion. Perhaps some of our atmospheric chemists could comment on the proportion of variance in ozone depletion accounted for by rising CFC concentrations?

Don Libby


It has been suggested and there is some evidence that the Pinatubo eruption increased the ozone loss last year in Antarctica. Also there is increasing interest in the probability that methyl bromide, a pesticide, is causing as much depletion as are CFCs.

Marc Fernau



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