1/4. We've discussed this before, Mark. Don't you remember this thread? https://twitter.com/ncdave4life/status/1698160818892775586… E.g., do you REALLY believe that global average temperatures 3000 years ago are known with a 1σ uncertainty of just 0.2°C, and 2σ (95%) of just 0.4°C? You've GOT to know that's absurd! The Hockey Team even completely erased Dansgaard-Oeschger event #1, which was the HUGE warming event, recorded in ice cores, that you can see in this NOAA plot: https://sealevel.info/Dansgaard-Oeschger_events_last_80K_years_noaa.png…

1/7. It tells a tall tale, Mark. https://twitter.com/ncdave4life/status/1647790852234788870… Here's a higher resolution version of that "tall tale," which I annotated (in very tiny print), to identify the DACP, MWP & Younger Dryas. https://sealevel.info/safe_climate_zone_wheelchair_climate_propaganda_graph_annot1.png…

The revisionist "hockey stick" narrative represents the substitution of political & pecuniary interests for historical evidence. History records the cycles that you deny: IACP 🡕 RWP 🡖 DACP 🡕 MWP 🡖 LIA 🡕 Modern Optimum Come on, do you REALLY believe that, contrary to all historical evidence, the Dark Ages Cold Period (circa 400 to 800 A.D.) was as warm as the Medieval Warm Period (850-1300 AD) and the Roman Warm Period (250 BC - 350 AD)? Here are some papers about the DACP, which you apparently don't believe in: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C34&q=%28%22Dark+Ages%22+OR+%22Late+Antiquity%22%29+%28%22Cold+Period%22+OR+%22Cool+Period%22+OR+%22Migration+Period%22+OR+%22Late+antiquity+little+ice+age%22%29&btnG=… Here are some resources to learn about the near-global MWP, which you apparently don't believe in, either: http://co2science.org/data/mwp/mwpp.php…

Despite the creativity of the Pages2K crowd, the reality is that there are no proxies at all which can determine past northern Arctic air temperatures. There is some very limited evidence regarding water temperatures, but, in the Arctic, air and water temperatures frequently move in opposite directions, because ice coverage causes warmer water but colder air. People tend to find what they're looking for, and the Pages2K mission biases their results. The purpose  of Pages2K is to straighten the hockey stick handle by erasing the MWP, DACP, RWP, etc. from history. The Pages 2K Network was created in 2008, to compile evidence for the merely “regional nature of the Medieval Warm Period and the Little Ice Age.” That dubious contention is quoted from the caption on Fig. 1 of their poster, though they more frequently use the revisionist term, “Medieval Climate Anomaly” or MCA: http://pastglobalchanges.org/download/docs/PAGES%20outreach/posters/2017-pages2k-phase3.pdf… Canadian scientist Steve McIntyre has written an excellent multi-part critique of the Pages2K project here: https://climateaudit.org/?s=PAGES2K He's also compiled a large collection of “hockey stick study” resources here: https://climateaudit.org/multiproxy-pdfs/… The Hockey Team wants you to think that the MWP was merely regional, and confined to the northern North Atlantic, especially Europe and Greenland. The problem is that there's a wealth of evidence for a MWP elsewhere. For instance, here are Law Dome (Antarctic) ice core data, back to year 1010: https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law_co2.txt… Scroll down past “CO2, 75 Year Smoothed.” Those measurements show smoothed CO2 levels peaked at ≈284.1 ppmv circa 1170 (MWP), and fell to their lowest level of ≈275.3 ppmv circa 1615 (LIA). That's a problem for the Pages2K claim that the MWP was confined to the North Atlantic region, because they cannot explain it showing up in CO2 records all the way down in Antarctica. An 8.8 ppmv swing is 1/10 of the entire 90 ppmv CO2 level variation that we see across glaciation cycles, and it occurred over a much shorter period of time, and without the benefit of ice sheet burial of organic material. So it suggests a global temperature decline from MWP peak to LIA bottom of around 1°C — which, coincidentally, is similar to the supposedly all-anthropogenic warming since the late Little Ice Age.

Well I guess you’ll have to wrestle with more than 60 paleoclimate reconstructions (and counting) that resulted in hockey stick temperatures Many have tried, all have failed G’luck