>>>> (hole in the ozon layer)
>>>
>>>What about it?
>>
>>It was said in the 90-ties that hole in the ozon layer would eventually grow to span the whole earth and it would be catastrophic for the rest of the world. As always with these things, there are multiple factors involved. CFC's are one factor, but the extremely cold nature and vortex winds on the antartic another. That is the reason why it occurs mainly there.
>
>You say it as if there were not actions taken to remediate the issue i.e. the Montreal Protocol.
>
>>
>>Again doomsday was predicted, but nowerdays nobody sees the hole in de ozon layer at the antartic as a real problem or threat. In fact there are signs it is recovering rapidly.
>
>That is not true, Ushuaia (the Southernmost city in the world, in Argentina) takes weekly measures of the size of the ozone layer "hole" and 2011 marked the end of four years of declining hole area.

Hugo,

please read the following.

http://www.livescience.com/27824-arctic-ozone-loss-nasa.html

This is exactly why I'm so skeptical that scientists call for doomsday are right. Just by measuring data, it does not mean you understand the problem.

See my sig.

Data < > Information < > Knowlegde < > understanding

Data = the measurements
Information = the size 2011 hole in the ozon layer is bigger than the year before that.
Knowledge = that the sizes are growing and shrinking through time
And Understanding of why this exactly is so is an entirely different matter. We do think we know the factors, but as the article above shows, the picture get a little clearer as we learn more, but its far from sharp IOW are far from complete in understanding.

Too many people are jumping way to quick from data to understanding.

Walter,