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Author: putnid Big gold star, 5000 posts Old School Fool Add to my Favorite Fools Ignore this person (you won't see their posts anymore) Number: of 59036  
Subject: Re: 11,300-year temp. reconstruction Date: 3/11/2013 11:28 PM
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Here's an essay on the hazards of splicing and comparing proxy data with thermometer data... - DB2

OK, I read the referenced link and all the associated links. Let me crudely summarize: the authors object to using actual temperature data at present day time frames, given that proxy data represent crude resolutions on the order of centuries or more. OK. I get that proxy data are crude temperature reconstructions by their very nature/resolution. OK. So what shall we do? Ignore actual contemporary data? Why? Shall we deem proxy data too crude for use? Why? Shall we, consequently, deem that we can't even approximate the past? I find these sorts of discussions pointless and, all too often, disingenuous.

I understand that, for most of Earth's history, there were no thermometers. Lacking precise information, we rely on proxy data. Proxy data are disputable. I get that. What I don't get are the sophists who value proxy data more than instrumental data. I've got no problems using whatever information we have (if it's determined to be fairly credible) to assess Earth's climatic history. Actual instrumental data are for more reliable than proxy data. I believe we should use the best data available to the extent we can.

For those seeking to dive quite a bit deeper (it's a lengthy piece with lengthy video interviews) into Marcott's paper, here's a good link:

http://tinyurl.com/aodpthh

Scientists Find an Abrupt Warm Jog After a Very Long Cooling

The last century stands out as the anomaly in this record of global temperature since the end of the last ice age…. This research shows that we’ve experienced almost the same range of temperature change since the beginning of the industrial revolution as over the previous 11,000 years of Earth history – but this change happened a lot more quickly.

In sum, the work reveals a fresh, and very long, climate “hockey stick.”
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