Old Rocks
Diamond Member
People that double check published papers are doing the scientific establishment a FAVOR.
If the peer review process would do due diligence none of this would be an issue.
And you can start tossing out the garbage with Mann whose hockey stick graph and anti-science efforts are a shame to real science, Matthew.
Really? So, link to scientific papers in peer reviewed journals that declare the Mann paper garbage. In the meantime, here you can find papers that support the Mann graph;
What evidence is there for the hockey stick?
A critique of the hockey stick was published in 2004 (McIntyre 2004), claiming the hockey stick shape was the inevitable result of the statistical method used (principal components analysis). They also claimed temperatures over the 15th Century were derived from one bristlecone pine proxy record. They concluded that the hockey stick shape was not statistically significant.
An independent assessment of Mann's hockey stick was conducted by the National Center for Atmospheric Research (Wahl 2007). They reconstructed temperatures employing a variety of statistical techniques (with and without principal components analysis). Their results found slightly different temperatures in the early 15th Century. However, they confirmed the principal results of the original hockey stick - that the warming trend and temperatures over the last few decades are unprecedented over at least the last 600 years.
While many continue to fixate on Mann's early work on proxy records, the science of paleoclimatology has moved on. Since 1999, there have been many independent reconstructions of past temperatures, using a variety of proxy data and a number of different methodologies. All find the same result - that the last few decades are the hottest in the last 500 to 2000 years (depending on how far back the reconstruction goes). What are some of the proxies that are used to determine past temperature?
Changes in surface temperature send thermal waves underground, cooling or warming the subterranean rock. To track these changes, underground temperature measurements were examined from over 350 bore holes in North America, Europe, Southern Africa and Australia (Huang 2000). Borehole reconstructions aren't able to give short term variation, yielding only century-scale trends. What they find is that the 20th century is the warmest of the past five centuries with the strongest warming trend in 500 years.
Bullshit.
Mann used proxy tree ring data until it became inconvenient then he tossed it in favor of actual measured temps while the proxy data showed a continued drop in temperature for the past 50 years.
You establishment ass wipes cant think about science without appealing to authority like some half wit legal clerk, 'But Dr. So-n-so says it is valid...' but never dealing with the evidence directly.
Mann should be shot for fraud like they do in China.
Now you have proved my point. First, you have never read Mann's original paper, or you would not be making dumb asses statements like that. Second, we have many more papers from Mann and others that used far more than tree ring data. As did his original paper.
Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia
Publications of the National Academy of Sciences.