Several of the hockey stick's most obvious problems are easy to grasp. The 900-year long handle completely ignores two indisputable eras, the Medieval Warm Period, from about 950 to 1250 A.D. and the later Little Ice Age from 1300 to 1850.I asked her for the evidence for these "indisputable eras," and she says she's just a book reviewer with no knowledge of what she's writing of:
I want to remind you that I am not a climate scientist, only a lowly book reviewer. I have no first hand knowledge of these well-documented time periods, only a faith in the knowledge and reputations of the climate scientists who write about them. Sort of how I trust my doctor to know the pills he prescribes will heal me without my understanding how or why.But it seems she only has "faith" (the opposite of science) in some climate scientists whose studies (she cites zero of them) she happens to like. When I asked her again, she wrote it's all "widely accepted" so she doesn't have to provide any evidence:
Regarding the "Medieval Warm Period" and "Little Ice Age", their existence is widely accepted - I didn't invent the terms after all - within both the lay and scientific communities. I would no more provide evidence of them than I would provide evidence of photosynthesis, but I know they are all real. How? I believe the reputable scientists.Clearly Lynne is out of her league here.... Like so many deniers, she thinks the science is all wrong, without actually knowing any of it.... That saves time, that's for sure!
There are peer-reviewed studies by over 750 scientists from over 450 research institutions in over 40 countries that have found a Medieval Warm Period of between 0.1° and 3.2° Celsius warmer than today in every corner of the globe - from Alaska to South Africa, Morocco to New Zealand, Bolivia to China, Egypt to New Guinea... Everywhere they look for it, they find it.while offering no evidence for this in his blog post or whether all these studies lead to a reconstruction of globally noticeable climate eras, as he and Lynne claim. Except for another opinion from the opinionated nonexpert Jonathan Jones.
OK, there was that study by the oil-funded CO2science.org...which was never published anywhere -- because CO2science wouldn't dare submit their work for peer review anywhere legitimate -- and which was debunked because the period of study of the papers cited differed by up to 500 years, and many were selectively interpreted. The study ignored "very wide" error bars, and one study that only went back to 1500 A.D. was included as evidence for the MWP. In short, that study was both wrong and dishonest.
Meanwhile, all quantative reconstruction studies I know of -- which are the opposite of scattered opinions about scattered studies by scattered nonexperts -- use available proxies to form a global perspective find no evidence for a global MWP or global LIA -- Tingley and Huybers, Marcott et al, PAGES 2k, and more.
Here's the abstract from the PAGES 2k study conducted by over six dozen paleoclimatologists from 24 countries, based on 511 climate archives from around the world and published in Nature Geosciences:
Stefan Rahmstorf, who wasn't part of this study, wrote about it for ThinkProgress, and gave the paper's main result:
Rahmstorf then gives their reconstruction, labeled by "b" below -- which is, not surprisingly, a hockey stick, because a hockey stick is expected from very simply physics:
Who are you going to believe -- the careful work by six dozen experts from around the world, who put all the data together into regional and global reconstructions, or the opinions of some nonexperts who took studies individually without trying to acquire a global perspective?
Finally, let's note again that even IF there was a global MWP, it says absolutely nothing about the current era, when greenhouse gases dominate and the amount of energy the Sun is delivering to the Earth has been on a declining trend since about 1960.