Don,
I looked at both you links thanks. I have not seen what they think the cause of the Middle Ages warming was. The graph did appear to be slanting upward, it will be interesting to see what happens in next five years. If it ticks up again it seems that will indicate gradual warming. Not using tree-ring data does seem valid but it does not contain much data of upper atmosphere vs lower atmospheric temperatures. Still the question remains what would have happened in middle ages if man was putting the gases in the air we are today. Would man have been adversely affected if our population numbers of today existed then. It seems premature to claim man can't effect it. IE: Increasing Greenhouse Gases unchecked for next 50 years. If extreme warming can occur period (with or without mans influence), shouldn't we a least plan for the future? Some of what Plan B calls for. I am interested in your opinion on Oil Shale. Can it be practical to produce a lot of Oil? or: Do the water demands dictate that it can be developed only on a very limited basis? Erik See
http://www.drroyspencer.com/global-warming-background-articles/2000-years-of -global-temperatures/
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Don J. Colton Sent: Tuesday, March 10, 2009 8:39 AM To: 'Utah Astronomy' Subject: Re: [Utah-astronomy] Latest Global Temperature Data
See http://www.drroyspencer.com/latest-global-temperatures/
And a short summary of Roy Spencer's research http://www.drroyspencer.com/global-warming-natural-or-manmade/
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