NeonSamurai |
12-10-09 12:32 PM |
Quote:
Originally Posted by August
(Post 1217115)
I wouldn't put yourself out to make a point on an internet forum. It ain't like anyone's mind would be changed... :)
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Eh hasn't stopped me in the past though I do not try to go to nuts. ;)
You are right though, I don't think any of these debates have changed any minds really. Which suggests that its a total time waster, and I probably shouldn't bother so much. :yawn:
Quote:
Originally Posted by SteamWake
(Post 1217113)
I just cant look at any chart, graph, or report anymore without a jaded eye.
One thing I note on that graph is it is quite spread out with hundreds/thousands of years between divisions untill it gets to the end when suddenly the scale shifts to 10 years or so or 1/1000th of the previous scales. That alone would skew the portrayel.
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Good eye, that is a key reason why I don't like that graph, there is a scale shift (though not as dramatic as you are suggesting, the scale cuts by less then about 1/2). Graphs are great for presenting numbers, but very easily manipulated. For example changing the X scale would make the data seem more or less significant on what way I change the scale. I could make that graph look like massive peaks (or changes), or barely any change at all. One should always look at the numbers both in the graph, and behind them.
Anyhow here is the same graph again, with out that scale error, and a report with full citations too.
http://www.daviesand.com/Choices/Pre...ning/New_Data/
It shows the same trend, but that is not surprising when the scale of the graph is in sub divided 50000 year segments. High levels of man made CO2 production only started in the last 150 years or so. They don't though say the zero point in this graph, though it is probably 0 BP (Before Present) or 1950.
They seem to be blending data sources in that graph however (not just different ice core data, but also are also including direct measurement), which might be problematic. I would have to look into the sources, and the science behind it to draw any conclusions as I am not sure if that is scientifically acceptable or not.
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