[gomaaa]

The hole seems to be shrinking:

http://news.bbc.co.uk/2/hi/science/nature/1050495.stm

Note that they directly attribute this to the global ban on PCB's. If we start making these chemicals again, the effect will reverse.

[metmom]

Funny that that little tidbit never made much headlines, at least I don't remember hearing much about it at the time. The problem is that there is no way to know what went on before we found the ozone layer and started measuring it.

I found this particular comment in the article rather interesting: And a cooling of the lower atmosphere due to greenhouse gas emissions could delay the closing of the ozone hole, perhaps by a decade or so. So greenhouse gases cause cooling...but they're greenhouse so it should be warming...*sigh* we just can't win.