The reason...

The reason why i choose Acid Rain rather than Global Warming is because i found these link on the internet....
1.http://www.sciencedaily.com/releases/1999/07/990708075951.htm
2.http://www.globalwarming.org/node/686
3.http://www.newscientist.com/article/dn6231-acid-rain-limits-global-warming.html

It may be look like it off topic but it really does has a connection to the global warming....

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