The global average temperature chart generally known as the "Hockey Stick" was originally popularised by Michael Mann several decades ago: https://en.wikipedia.org/wiki/Hockey_stick_graph_(global_temperature) and has been brought up to date and reproduced independently many times: https://en.wikipedia.org/wiki/Temperature_record_of_the_last_2,000_years For example, the chart below is from Ed Hawkins, covering about 2,000 years of temperature records and proxies: The data behind the hockey stick are extensive, solid and are publicly available for anyone to undertake their own reconstructions. The hockey stick chart, alongside many other deep and overwhelming lines of evidence, enable the IPCC to say, in its report IPCC AR6 WG1 (2021): "It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred." In contrast to that, there are some people (many of them without relevant scientific qualifications) who produce what is generally known as "pseudoscience" - constructed charts of very poor scientific rigour - usually in an attempt to sow FUD (Fear, Uncertainty or Doubt) about the scientific findings on AGW. An example of that has recently re-appeared on social media. It's a chart produced by Cliff Harris and Randy Mann, two meteorologists with, apparently, no relevant qualifications in climate science. I reproduce it here with a big health warning: This is an example of pseudoscience. It's even classified on the Internet Archive as "Misinformation/Disinformation" https://archive.org/details/7da-2748bffc-84a-36fc-276e-61ae-31204f-imagejpeg To anyone undertaking the most basic of fact-checking, this chart quickly reveals important deficiencies.
The most important of these is that it has no vertical scale, which means that it is impossible to make any comparisons with confidence between areas to the left of the chart (mid-Holocene era) and areas to the right (modern history). It also means that it is almost impossible to fact-check any parts of the chart to other data sources, because there is no quantitative value shown to check against any other source. But, comparing it to the accepted, verified and repeated Michael Mann hockey stick chart, it is clear that the Cliff Harris and Randy Mann chart is severely misleading if it is used to suggest or imply anything about AGW (Anthropogenic Global Warming). If you see the Cliff Harris and Randy Mann chart doing the rounds, please call it out for what it is - misinformation (disinformation if the person spreading it is intending to deceive).
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