Quote:
Originally Posted by camaraderie
Jody...your de-buttal on tree rings was great...just the sort of stuff we need to discuss. Did you happen to read the beginning of the article you linked to where the tree ring data was being used to rebut the notion of the midieval warming period that "deniers" claim? Inconvenient to GW's if humans actually lived in warmer times without a problem. You see...THAT tree ring data was used in the UN's IPCC report to justify a rising global temperature and knock down the midieval warming theory. SO...choice...tree ring data IS or IS NOT useful in describing past climate. I will be happy to agree with you that it is NOT if you want to throw out that part of the UN's justification of warming and Al Gore's film piece on it.
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Trust me I really do not care about Al Gore's statistics - however, the overall message is there and if it had not raised such a stink - we'd all actually be far less educated over the matter nor willing to google for hours on end to find "the truth in between"....Interestingly enough that chart used in the IPCC study was pulled last year on the grounds of scientific outcry that it did NOT take in account the reasons mentioned in my last post on this matter. Hence why I used it as a debuttal...the one you listed -it may be flawed
There is data there - but it is not CONCLUSIVE to GW specifically - it is only a piece of data that alone does not stand to support GW, only provides a indicator...
Now if we are only talking tracking CO2 and not the other 3 common GHGs, scientists are now analyzing fossils of plants. The CO2 cells within the plant leaf become bigger and less numerous when there is a high CO2 content and more numereous and less in size when CO2 is not as abundant. However, even with this I think may be inaccurate as it may not account for other conditions that the plant may be going through such as high heat, etc (basically the same stuff that quantifies the tree ring can not necessarily be used soley to say hey "this happened")..but scientists think it is a more fail-proof method...
Interesting read:
http://www.guardian.co.uk/environmen...arbonemissions
As for the mini Ice Age - that has been determined to be caused by a sunspot that collapsed making the sun cooler. The medieval heat wave is believed caused by huge lava eruption in siberia...
I'll take a look at the link later - think I am kinda globalled out from watching the shows all day on the History Channel and doing research