Verified answer

The repeating of things from such blogs can be seen in the answers here.

"an entire civilization had to leave Greenland because it got too cold"

well as far as is known there were a handful of viking communities and they only occupied the south west coast, denier also seem to forget that the Eskimos also lived/live in Greenland before during and after the Vikings and still do today. If deniers were actually doing any research on these facts the Viking would not change their ways to adapt they didn't really farm but did raise animals and they didn't fish, exhumed viking bodies show signs of malnourishment.

"I guess next he is going to drag out the Piltdown man."

The only ones dragging out the Piltdown man are deniers many scientist thought it a fake from the start and when test in 1953 were developed it was proved a fake, with tests available today such fake could be identified in a few hours.

The main jist of your question

"some evidence that the period 800 years before that was as warm as today"

I am not going to try and use climateaudit or warwikhuges as info sources as they are blogs with little if any scientific standing

and the climate of the period in question 800 years ago.

This reconstruction uses 10 different sources while there is some variation, all of them show the period in question to be nowhere near as warm as today.

(only a couple of them are from Mann, for the Mann haters)

http://en.wikipedia.org/wiki/File:2000_Year_Temper...

There is a reason why most of the world thinks this is happening

And finally

""Hans Brinker" talk about skating on the canals in Holland unless it could be done?"

This is a classic denier comment and shows how little they really look into what they are repeating, the American Author Mary Mapes Dodge never visited the Netherlands. Such ice racing has happened during cold snaps during and long after the little ice age the last was 1997

http://www.thehollandring.com/11stedentocht.shtml

Bloggers didn't invent the medieval warming period. It was the prevailing scientific theory with good support from proxy and historical data untill Micheal Mann set out to discredit it. This is why so few geologists believe in significant AGW.

He wouldn't be the first researcher in history to discover exactly what he was looking for even if it wasn't there. That's what tends to happen when you discard the scientific method.

You have to of studied history, geology, geography, oceanography and few other sciences to know these things. There is more than 8,000 years of accumulated knowledge that skeptics can access but warmers did not study these subjects and so do not understand them.

Historical evidence.

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There are ice core data to show that. If you don't like that, an entire civilization had to leave Greenland because it got too cold. That was when it was warmer than today. I don't need a link because it is common knowledge except to the true deniers that don't accept anything but their own political propaganda. England used to grow grapes until it got too cold. it still isn't warm enough.

Here is one of those links you like so well.

http://www.climateaudit.org/?p=145

I am going to have to rely on you to correctly read the graph (look at the second graph). It is not proof that it was warmer but it is evidence. Historical accounts also provide evidence. I wouldn't trust tree ring proxies but other proxies are consistent with the Sargasso Sea. The Sargasso Sea is related to European weather and it is historically consistent.

Dana likes to cherry pick his proxies many of which can be demonstrated to wrong based on historical accounts from China and Europe. It isn't about discovering the truth. It is about hiding and ignoring evidence that doesn't support your paranoia. He actually had the gall to link to Mann, a confirmed hoaxer. I guess next he is going to drag out the Piltdown man.

Here is one from Greenland Icecore

http://www.warwickhughes.com/geol/img_LG16.htm

http://carbon-sense.com/wp-content/uploads/2009/01...

Look at figure 1. Read the citatations under it.

Didn't the ice-cores confirming the link of CO2 and global warming come from around 1000 years ago too? If we are to discount the "little" information given about temperature "readings", surely you can't expect me to jump all over the ice-core data as if it's real, right?

By the way -- the information is irrelevant. Here's the type of data you need anyway -- in comedy form. It's so simple and logical it's funny.

"George Carlin's "The Planet Is Fine"

http://www.youtube.com/watch?v=ljNDbKpusT0

We're so self-important. So self-important. Everybody's going to save something now. "Save the trees, save the bees, save the whales, save those snails." And the greatest arrogance of all: save the planet. What? Are these bleeping people kidding me? Save the planet, we don't even know how to take care of ourselves yet. We haven't learned how to care for one another, we're gonna save the bleeping planet?

I'm getting tired of that bleep. Tired of that bleep. I'm tired of bleeping Earth Day, I'm tired of these self-righteous environmentalists, these white, bourgeois liberals who think the only thing wrong with this country is there aren't enough bicycle paths. People trying to make the world save for their Volvos. Besides, environmentalists don't give a bleep about the planet. They don't care about the planet. Not in the abstract they don't. Not in the abstract they don't. You know what they're interested in? A clean place to live. Their own habitat. They're worried that some day in the future, they might be personally inconvenienced. Narrow, unenlightened self-interest doesn't impress me.

Besides, there is nothing wrong with the planet. Nothing wrong with the planet. The planet is fine. The PEOPLE are bleeped. Difference. Difference. The planet is fine. Compared to the people, the planet is doing great. Been here four and a half billion years. Did you ever think about the arithmetic? The planet has been here four and a half billion years. We've been here, what, a hundred thousand? Maybe two hundred thousand? And we've only been engaged in heavy industry for a little over two hundred years. Two hundred years versus four and a half billion. And we have the CONCEIT to think that somehow we're a threat? That somehow we're gonna put in jeopardy this beautiful little blue-green ball that's just a-floatin' around the sun?

The planet has been through a lot worse than us. Been through all kinds of things worse than us. Been through earthquakes, volcanoes, plate tectonics, continental drift, solar flares, sun spots, magnetic storms, the magnetic reversal of the poles...hundreds of thousands of years of bombardment by comets and asteroids and meteors, worldwide floods, tidal waves, worldwide fires, erosion, cosmic rays, recurring ice ages...And we think some plastic bags, and some aluminum cans are going to make a difference? The planet...the planet...the planet isn't going anywhere. WE ARE!

We're going away. Pack your bleep, folks. We're going away. And we won't leave much of a trace, either. Thank God for that. Maybe a little styrofoam. Maybe. A little styrofoam. The planet'll be here and we'll be long gone. Just another failed mutation. Just another closed-end biological mistake. An evolutionary cul-de-sac. The planet'll shake us off like a bad case of fleas. A surface nuisance.

You wanna know how the planet's doing? Ask those people at Pompeii, who are frozen into position from volcanic ash, how the planet's doing. You wanna know if the planet's all right, ask those people in Mexico City or Armenia or a hundred other places buried under thousands of tons of earthquake rubble, if they feel like a threat to the planet this week. Or how about those people in Kilauea, Hawaii, who built their homes right next to an active volcano, and then wonder why they have lava in the living room.

The planet will be here for a long, long, LONG time after we're gone, and it will heal itself, it will cleanse itself, 'cause that's what it does. It's a self-correcting system. The air and the water will recover, the earth will be renewed, and if it's true that plastic is not degradable, well, the planet will simply incorporate plastic into a new pardigm: the earth plus plastic. The earth doesn't share our prejudice towards plastic. Plastic came out of the earth. The earth probably sees plastic as just another one of its children. Could be the only reason the earth allowed us to be spawned from it in the first place. It wanted plastic for itself. Didn't know how to make it. Needed us. Could be the answer to our age-old egocentric philosophical question, "Why are we here?" Plastic...bleephole.

So, the plastic is here, our job is done, we can be phased out now. And I think that's begun. Don't you think that's already started? I think, to be fair, the planet sees us as a mild threat. Something to be dealt with. And the planet can defend itself in an organized, collective way, the way a beehive or an ant colony can. A collective defense mechanism. The planet will th

Oh, little things like people writing about what things were like, towns that were growing grapes in northern Great Britain, etc.

There are also records of the little ice age, like the writings of Dickens (Why would he write about huge snowfalls in London unless they were happening? Why would the story "Hans Brinker" talk about skating on the canals in Holland unless it could be done?) Paintings, etc.

Why, for example were so many explorers looking for and puzzled by the absence of the Northwest Passage unless it actually existed? (They could sail across the Arctic Ocean!)