<blockquote>Temperature trends over the past five centuries reconstructed from borehole temperatures</blockquote>Short enough to miss the Medieval Warming Period. Oops!
All you've <strike>got </strike>offered is theory, no temperatures. Oh yes, boreholes. Your link is paywalled, but I found a <a href="http://oceanservice.noaa.gov/education/pd/climate/teachingclimate/climate_change_present_past_and_future.pptx" rel="nofollow">.PPT that appears to have it.</a> The curve there is quite consistent with a much deeper LIA than <i>"consensus Climate Science"</i> recognizes, along with a much higher Medieval Warming. Here's what <a href="http://en.wikipedia.org/wiki/Proxy_%28climate%29#Boreholes" rel="nofollow">Wiki</a> says about borehole temperatures:<blockquote>Borehole temperatures are used as temperature proxies. Since heat transfer through the ground is slow, temperature measurements at a series of different depths down the borehole, adjusted for the effect of rising heat from inside the Earth, can be "inverted" (a mathematical formula to solve matrix equations) to produce a non-unique series of surface temperature values. The solution is "non-unique" because there are multiple possible surface temperature reconstructions that can produce the same borehole temperature profile. In addition, due to physical limitations, the reconstructions are inevitably "smeared", and become more smeared further back in time. When reconstructing temperatures around 1,500 AD, <b>boreholes have a temporal resolution of a few centuries.</b> [my bold]</blockquote>More time-wasting non-answers from FOMBS