The Long Little Ice Age: WI no Medieval Warm Period?

Climate is a fickle mistress, so what if for some reason instead of the climate warming during 800-1300 AD, it kept getting colder. So, a Long Little Ice Age lasting for almost 1000 years from 400 AD, actually becoming its most severe around the time of OTL's Medieval Warm Period?
So instead of the Up tick just after 500 on your chart. Whe get a continuing down ward [see red line on chart below] and No it wouldn't be nice and straight like my line.

Say the Long Little Ice Age begins to end around the 19th century. What would the world look like then?
?Why would it ? See my Yellow line showing a long term downward trend.

OTL The 500 - 1200 warming brought a period of good climate to Southern France as good that that saw the rise of the Roman Empire.
Crops were very good, The political situation was stable, and a population boom broke out. The population jumped by 50~60 % in Spots, and a shortage of cleared land developed.
By 1250 the clearing of the primeval forests in south France began, by the 1400's The Great Clearing reached North France and South England.
By the 1600 it reached Germany and it jumped the Atlantic to the New World.
In the late 1800's it was in western Russia and reached the American west coast
In the early 1900's it crossed the Urals and jumped the Pacific. It also jumped the Equator.
The two waves are expected to met in central Siberia around 2050. Ending a 800 year old cultural phenomena.
At this time all the Worlds forests will have been cut down some time in the last 800 years At least once.

However by 1750 enuff of the worlds forests had been cut to begin effecting the world Climate ending the Ice Age and starting the Uptick whe enjoy today.


But in Your Scenario there will be 1200 warm period. No Great Clearing. The Primeval Forest will continue to expand as the population migrates south.
No Vinland, or Greenland. In fact probably No Iceland settlement.
No 1300 migration of rats in China to spread fleas & the begining of the Black Death.
It will probably be earlier, but with more of the Silk trade carried by Indian ships and less by Camels [fleas] the Vector & spread will be a lot different,
More in the growing NAfrica and less in Underpopulated Europe.

According to your Chart the warming starts in the late 400's early 500's,
I'm wondering if without the warming If South Arabia may be a little wetter.
More Water in the Great Dam, means more Maintenance,
Or, this Micro Climate change may butterfly the Catpox epidemic of the 680's, With the Cats not dieing, they prevent the Rats from damaging the Dam.
Yemen remains the Green & Fruitful - Bread Basket of the area, The Bishopric remains in Yemen.
Merchant's Son Mohammad never argues with the Bishop, and is not exiled to join/preach to the Nomads,

I'm trying to figure the Migration Patterns of the American tribes, I know this will affect the tribes that migrated from central Manitoba to become the Comanche/Apache/Navajo.
?But the Migration of the Great Lake Tribes down the Appalachians/East Coast?

Whe are going to see an increase in the size of the South African and Andes Deserts. This means less Migration south in both areas.

Less Japanese migration Northward, and less pressure on the Ainu.

longlittleiceageclimateotl.PNG
 
Whe are going to see an increase in the size of the South African and Andes Deserts. This means less Migration south in both areas.
In the case of the former, I presume you mean the Bantu. In fact by 400/500AD they had reached their maximum expansion anyway. What is very likely to happen is a rollback of the Bantu in the south to the Khoisan advantage. Then if/when non-Africans (Europeans, Arabs, Chinese, take your pick) could to colonise southern Africa they should be able to occupy a large territory before they can into serious conflict with the Bantu.

In addition a colder world is reduce the area of tropical rain forest and so reducing the hunting grounds of the Pygmies. I would thus expect their population to drop.
 
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