Really?
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Dr. Phil Jones, director of the University of Anglia's Climactic Research Unit, May 7, 2009:
"Bottom line - the no upward trend has to continue for a
total of 15 years before we get worried."
http://www.burtonsys.com/FOIA/4199.txt
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NOAA, August 2009, (Page S23):
"The simulations rule out (at the 95% level) zero trends for intervals of
15 yr or more, suggesting that an
observed absence of warming of this duration is needed to create a discrepancy with the expected present-day warming rate."
http://www1.ncdc.noaa.gov/pub/data/cmb/bams-sotc/climate-assessment-2008-lo-rez.pdf
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Dr. Ben Santer, lead author on the IPCC's 2005 report, Nov. 17, 2011:
"In order to separate human-caused global warming from the "noise" of purely natural climate fluctuations, temperature records must be at least
17 years long, according to climate scientists."
https://www.llnl.gov/news/separating-signal-and-noise-climate-warming