Most of the Recent Warming Could be Natural

By Jennifer Marohasy – Re-Blogged From http://jennifermarohasy.com

AFTER deconstructing 2,000-year old proxy-temperature series back to their most basic components, and then rebuilding them using the latest big data techniques, John Abbot and I show what global temperatures might have done in the absence of an industrial revolution.  The results from this novel technique, just published in GeoResJ [1], accord with climate sensitivity estimates from experimental spectroscopy but are at odds with output from General Circulation Models.

According to mainstream climate science, most of the recent global warming is our fault – caused by human emissions of carbon dioxide.  The rational for this is a speculative theory about the absorption and emission of infrared radiation by carbon dioxide that dates back to 1896.  It’s not disputed that carbon dioxide absorbs infrared radiation, what is uncertain is the sensitivity of the climate to increasing atmospheric concentrations.

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Warm Periods in the 20th Century are Not Unprecedented During the Last 2,000 Years

From Eurekalert – Re-Blogged From http://www.WattsUpWithThat.com

Institute of Atmospheric Physics, Chinese Academy of Sciences

A great deal of evidence relating to ancient climate variation is preserved in proxy data such as tree rings, lake sediments, ice cores, stalagmites, corals and historical documents, and these sources carry great significance in evaluating the 20th century warming in the context of the last two millennia.

Prof. Quansheng Ge and his group from the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, collected a large number of proxies and reconstructed a 2000-year temperature series in China with a 10-year resolution, enabling them to quantitatively reveal the characteristics of temperature change in China over a common era.

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IMAGE: 2,000-year temperature reconstruction in China. view more

Credit: Yang Liu & Jingyun Zheng

 

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