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science
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After the fifteen-squillianth time this question has been asked, by C-F-C, i'm not thinking chloro-fluoro-hydrocarbons!
And just in case you hadn't noticed the three other times this question appears on the science topic front page alone, (in fact there's one just three questions below yours)
- or the fact that when you posted your question you were asked "this may have been asked before - do you still want to post?"
- then there is a 'search' function below left. Try using it.
God, I feel better for that.
http://www.theanswerbank.co.uk/People_and_Places/Question197476.html
acid rain-producing sulfur dioxide