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Originally Posted by SPRINGFIELD
Well that's the funny thing, in my (short) time on earth, it seems to me that spring has been "springing" earlier. And my father who is a biology teacher-has a set of pictures taken on april 10th 1915, and an identical set taken from the exact same location on April 10th 2005,6,and 7. BIG difference. Not conclusive evidence by any means, but a vivid visible example.
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1915 is a very cold time to start at, it was just after the end of the 19th century's volcanic period.
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Spring is happening earlier, at least in Iowa. But some of the things from that article make sense, if that "hockey stick" graph he referrs to is indeed flawed, all the data for global warming is compromised.
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He really doesn't know what he is talking about though. The original hockey stick was a 1998 analysis. Indeed the statistical methods it used were not ideal and there are other points involving some of the proxy series that are legitimate. However the National Academy of Sciences did a comprehensive review of temperature proxies including half a dozen later papers that produced similar results using updated statistical techniques and deemed their results as valid which supported the conclusions of the original hockey stick.
Regardless global warming theory is not based on temperature proxies. Almost all of the warming has occurred during times of instrument readings. The physics involved do not depend on them whatsoever and key estimations such as climate sensitivity are based on much longer periods of time (ice ages).