A new proxy reconstruction of the last two thousand years of temperature shows that there has been a decline of 0.3 degrees per millennium over the that period.
Published in Nature Climate Change the paper finds that orbital forcings (essentially how close the sun and the earth are) are around four times as significant as CO2 emissions.
The reconstruction uses Maximum Latewood Density (MXD) rather than Tree Ring Width (TRW), the method used by the notorious Michael Mann Hockey Stick.
The authors are obviously painfully aware of the fraud practiced by Mann where he substituted instrumental records for proxies when the proxies didn’t show what he wanted (otherwise known as “Mike’s Nature trick”) as above their most significant graph they show how their records correlate with the temperature record up to the end of the reconstruction.
The tree rings are only from Sweden, which means that they aren’t global, but then neither was the Hockey Stick. Significantly for global warming models the Arctic regions are supposed to warm faster than the equator, so if there was unusual 20th Century warming it should show up here before many other places.
It also has implications for recent events in Queensland where the 12th International Coral Reef Symposium has been hearing how accelerating global warming is already affecting the Great Barrier Reef. On the basis of this they’re not facing anything they haven’t faced in recent geological time.