Solar,
Am I to understand that you will not accept anthropogenic GHG theory until it has been proven over geological time periods? The significant correlation you ask for would only be required if GHG theory attributed all past climate events to GHG's, it does no such thing. It attributes our current warming trend to GHG's and thus a correlation over a shorter time period where GHG's are believed to be the primary instigator of climate change is more than acceptable, we have a very close and significant correlation for this time.
Who has said that the cooling period you mention must be explicable through GHG's alone? As far as I can see it is only the ill-informed GHG sceptics which make this assertion, little bit suspect that isn't it? GHG theory does not require the absence of further affecting factors, factors involved in climatic forcing need not be mutually exclusive as you are claiming here, what GHG theory tells us is that our contributions of GHG's to the atmosphere are driving the current enhanced warming trend we are observing.
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