[wbill]

ozone hole has actually shrunk by an area half the size of the contiguous United States, although the process is also heavily affected by variables such as volcanic eruptions from year to year.

shhhhh.... You mean, we can't control the weather? Don't nobody tell AlGore.

[calljack]

I would like to know what they mean by “heavily affected”
10%?
98%?
Those are the most important two words in this entire article and we have absolutely no information on what they mean.