re: Global warming question for both sides....

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SO my question is, what was the cause of the event in the past?

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Impossible to come up with 'causality' for a very, very complex system such as the Earth's atmosphere. All who try are wasting their time.

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Or Dems arguing that the climate change is actually a "returning to past" climate change?

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Yes, their arguments around this issue are asinine.

The Democrats should take the position that businesses producing effluents, discharged to atmosphere, shall always have the 'burden-of-proof' on them. The bigger the point-source of pollution, the more harm it could possibly cause. IOW, 100 LB/HR pollution from one heater stack is much more of a concern than 1 LB/HR pollution from 100 individual point-sources.