Cold kills. Warmth makes life flourish on Earth. When it become colder or warmer the ideal zone shifts from north to south. It is not sudden but slow as is rising sea level or receding sea level. At the end of the last ice age the Dogger banks of the North Sea were above water and inhabited. Today they are far beneath the surface. The vast majority of sea level rise since the end of the ice age has been preindustrial times. Why did it melt? Man had nothing to do with this? Not one damn drop of petroleum was being burned before or after the last ice age until “Drake 1” in Pennsylvania. Why did the rapid rate of melting slow down even before CO2 was a factor?
The Drake Well, also known as “Drake’s Well 1, is the first successful commercial oil well in the United States, located in Cherrytree Township, Pennsylvania. Drilled by Colonel Edwin Drake in 1859, it struck oil at a depth of 69.5 feet, marking the beginning of the American oil industry.
It is really about orbital mechanics of the earth and changing axial inclination. This effects the total energy the earth receives from the sun. It is really that simple.
Malankovitch a brilliant astrophysicist figured this out long ago. From Wiki, “Milutin Milankovitch (1879-1958) was a Serbian mathematician, astronomer, and geophysicist who is best known for his theory of Milankovitch cycles, a theory that explains long-term changes in Earth’s orbit and rotation and their relationship to climate change, particularly during ice ages.
In political correct scientific communities they ignore his work as it defies the current scientific fraud about global warming.
Forgot to add this:
Orbital mechanics involve two things of importance. Distance and inclination. The distance part is easy. The further from the sun the square of the distance defines total energy from the sun. 1 squared is 1. 1.05 squared is 1.11 which seems insignificant is 11 percent less energy from the sun. I just used this as an example as I do not know the true distances from the sun for the Malankoviche cycles, The Earth is in the ideal zone for life. Small variations in solar absorption will easily plunge us into an ice age or the current inter glacial period we enjoy.
The inclination is a bit different. The polar caps reflect most of the sunlight back into space. The Arctic Cap is far smaller than the southern Antarctic cap. When the inclination of the earth is mostly to the Arctic cap less light is reflected into space and warming happens as today. When the Antarctic which is far larger gets more direct exposure to sunlight much more energy is reflected into space. Thus the ice age comes again.
There’s no gradualist mechanism that can cause glaciation, so, no, Milankovitch’s model is wrong.
I wonder what connection, if any, there is between the 6th century cold period and the 7th century rise of Islam.