Climate 'urban myths' have plagued policymakers and the public for years - fortunately Michael Mann's "unprecedented" modern global warming myth is finally dying an empirical-death
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The classic climate "science" urban myth is that 20th century global warming was "unprecedented" when in fact empirical study after study proves that myth to be without scientific merit. And now a new study demolishes that myth conclusively - will the discredited 'hockey stick' caricature of past temperatures now finally die?
"Working with the GISP2 ice core from the Summit region of central Greenland, Kobashi et al. reconstructed Greenland surface snow temperature variability over the past 4000 years with a method that utilizes nitrogen and argon isotopic ratios..."The estimated average Greenland snow temperature over the past 4000 years was −30.7°C with a standard deviation of 1.0°C and exhibited a long-term decrease of roughly 1.5°C, which is consistent with earlier studies. The current decadal average surface temperature (2001–2010) at the GISP2 site is −29.9°C. The record indicates that warmer temperatures were the norm in the earlier part of the past 4000 years, including century-long intervals nearly 1°C warmer than the present decade (2001–2010). Therefore, we conclude that the current decadal mean temperature in Greenland has not exceeded the envelope of natural variability over the past 4000 years..."" [Takuro Kobashi, Kenji Kawamura, Jeffrey P. Severinghaus, Jean-Marc Barnola, Toshiyuki Nakaegawa, Bo M. Vinther, Sigfús J. Johnsen, Jason E. Box 2011: Geophysical Research Letters]
- Arctic Greenland was warmer than modern warming during the Bronze, Roman and Medieval periods - ergo, modern warming not unprecedented
- Despite massive industrial/consumer human CO2 emissions, modern warming is easily within natural climate variation
- Scientists claiming that modern warming is "unprecedented" are simply lying (or, amazingly ignorant of the plethora of actual empirical evidence)