climate-wise, because the effects of however you choose to describe our curent little 'warming period' are undeniable (Vanuatu, Kiribati, anyone?)
your assertions regarding MWP are arguable, at the very best, and cast grave doubts on the reliability of your POV, despite the possible accuracy of the other, conveniently cherry-picked data you provide, which ignores the overall picture, and leads, inevitably, to the conclusion that there's nothing we can do to alter the inexorable course of planetary warming
for a more thorough discussion of you medieval warm period assertion, I'd suggest going to the following site, where you'll find a more in depth discussion of the misleading version of climatic history you offer here
http://www.grist.org/article/the-medieval-warm-period-was-just-as-warm-as-today/ the follwing quote from the above link deals with your contribution much better than I can:
John Tukey was one of the world's greatest statisticians, and he had good observations:
"Far better an approximate answer to the right question, which is often vague, than an exact answer to the wrong question, which can always be made more precise."
"The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data."
Whether or not we are now warmer than the MWP is the wrong question, and in fact, as interesting as it might be, arguing it gives a perfect opportunity for anyone who wants to create clouds of confusion to do so.
The argument "it's warmer than the MWP, and therefore we should do something about AGW" invites the response "but we really don't know", and then lots of confusing side-tracks.
The stronger argument to me is: "Whether we are warmer or not already, we're going up fast, and the physics says we're going to keep going up, we have 10X more people on the planet, and 50% of the world's population lives within 120 miles of the ocean, and anything we can do to slow down the inevitable temperature rise will give more time for ecosystems adaptation, will likely cost less, and maybe will save some wars (over water, if nothing else)."
Suppose someone could magically duplicate our current temperature sensors 10,000 years back, and have a current-technology record from then. Climatologists would be ecstatic, and models might improve, but otherwise, what would you do differently if it turned out the MWP were global, and a little warmer than now? or global and a little cooler? or not global? anyone with less than a comprehensive background in atmospheric science, etc., can go here for extended discussions of the current climate situation, with extended comments by people with real expertise. lots of it is way over my head, but one can make up one's own mind, relatively uncolored by disingenuous contributions like the ones referred to here
http://www.grist.org/article/series/skeptics/some of the topics available for discussion at the 'skeptics' link:
Stages of Denial There's nothing happening Inadequate evidence
*There is no evidence
*One record year is not global warming
*The temperature record is simply unreliable
*One hundred years is not enough
*Glaciers have always grown and receded
*Warming is due to the Urban Heat Island effect
*Mauna Loa is a volcano
*The scientists aren't even sure
Contradictory evidence
*It's cold today in Wagga Wagga
*Antarctic ice is growing
*The satellites show cooling
*What about mid-century cooling?
*Global warming stopped in 1998
*But the glaciers are not melting
*Antarctic sea ice is increasing
*Observations show climate sensitivity is not very high
*Sea level in the Arctic is falling
*Some sites show cooling
No consensus
*Global warming is a hoax
*There is no consensus
*Position statements hide debate
*Consensus is collusion
*Peiser refuted Oreskes
We don't know why it's happening Models don't work
*We cannot trust unproven computer models
*The models don't have clouds
*If aerosols are blocking the sun, the south should warm faster
*Observations show climate sensitivity is not very high
Prediction is impossible
*We can't even predict the weather next week
*Chaotic systems are not predictable
We can't be sure
*Hansen has been wrong before
*If we can't understand the past, how can we understand the present?
*The scientists aren't even sure
*They predicted global cooling in the 1970s
Climate change is natural It happened before
*It was warmer during the Holocene Climatic Optimum
*The medieval warm period was just as warm as today
*Greenland used to be green
*Global warming is nothing new!
*The hockey stick is broken
*Vineland was full of grapes
It's part of a natural change
*Current global warming is just part of a natural cycle
*Mars and Pluto are warming too
*CO2 in the air comes mostly from volcanoes
*The null hypothesis says global warming is natural
*Climate is always changing
*Natural emissions dwarf human emissions
*The CO2 rise is natural
*We are just recovering from the LIA
everything you claim to be true and accurate is dealt with somewhere on this site