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Thunderchild. Humans have had the ability to pollute the Earth for well over 600 years. I read somewhere once (sorry I didn't keep it) that sulphur pollution levels back in Roman times when they were making swords and nice chariots were on a par with current pollution levels, even more so.
This 'discussion' has got quite technical and very interesting. There seems to be one recurring them in all the arguments however. Humans=Bad
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