>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.

Which doesn't stop them from acting on it. Since the eighties, when ozone hole scare was launched, we've had a wholesale replacement of fluid in heat exchangers (i.e. fridges, freeze boxes, ACs and other heat pumps) with those which don't use freon. And replaced the freon in spray bottles with other gasses, probably plain air. The cost is immesurable (because even if it was ever calculated, it would have to be compared with the cost of regular replacement, with theoretical cost of what would have been made-sold-installed if there was no change).

On the other side, we've also had the sun scare. A whole industry has sprouted to produce the skin cancer scare, on the assumption that the solar radiation has so drastically changed that staying in sunlight is now guaranteed to produce skin cancer unless you apply proper sun block. The result? Massive vitamin D insufficiency. And about 20 minutes of sunlight a day (unfiltered) should be enough to keep anyone supplied with it.