posted on Jun, 13 2007 @ 03:49 PM
OK, I'll give a critique of this stuff, as I do actually think you are open-minded enough to assess this stuff on its merits.
The first ice core data, that's cool. It shows that it was quite warm in greenland during the MWP. What about elsewhere?
Then we see the old Lamb (1991) data, this was the only reconstruction available all those years ago. It supposedly used data from one single area -
central england, no real indication of what proxies are used. So, we have two regional proxies saying it was pretty warm. But what about elsewhere?
This is what the modern data shows. The multi-proxy reconstructions use data from around the northern hemisphere. So, these reconstructions give an
idea of climate over large spatial expanse. A bit larger than just greenland and central england. So, we have numerous high resolution multi-proxy
reconstructions from many researchers, from IPCC 4AR:
So, what this guy is doing is cherrypicking data, just like most of these dudes. What about other ice-core data? Lonnie Thompson has 6 ice core
proxies from two quite distinct areas - Tibetan Plateau and the Andes:
As is clear, these multi-proxy reconstructions generally say the same thing, recent warming is likely greater than for 1000 years. So, Steffenson is
just cherrypicking, the Greenland data tells us it was warm in greenland, nothing more.
I think the last graph also contains the future projections of climate models for a particular scenario.
[edit on 13-6-2007 by melatonin]