Global warming/hockey stick

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one version of the hockey stick, from the IPCC 3rd Assessment Report in 2001
a 2013 version of the hockey stick, with data going back further
another 2013 version, this time showing CO2 levels going back ~420ky


The "hockey stick" is a well-known shape often found in charts showing global temperatures, where the time-span shown is at least a century or two and ends in the present.


  • /deception: global warming skeptics often claim that the hockey stick is a deception of some sort and does not represent a real phenomenon



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