The Viking Empire was active in 789 AD. And the Roman empire fell 406 AD. So we are talking about the end of the first millennia.
Greenland was lush, with no ice-cap. Then the ice-cap formed in the last ice-age, and that reservoir of cold never gave up on the ice.
So mill it, and let the ice chips flow back to the equator, melting. Ice is lighter than warm sea water, so will flow back to the warm. As cold sea water does today, driving the oceanic currents.
The Gulf stream warms Europe, and adds 20% of the warmth that gives us a moderate climate.
As you mill Greenland, you will remove the reservoir of cold, and we will once again get an active lush climate – taking on loads of CO2: biology naturally proceeds until there is a global average of 2 parts per million CO2 in the global air.
Levels are higher today above the Arctics. So we want to re-establish the lush Greenland. The Viking Age, from the eighty-eighth century to the 11th century, produced pioneering explorers such as Erik the Red, who founded Greenland’s first Norse settlement, along with powerful kings such as Cnut the Great, who ruled a vast empire in northern Europe. Find out more about these and other fascinating Norsemen below.
So you remove that big chunk of ice, and increase life on Earth.
We should also mill the South Pole – the coldest place on Earth: and ship all the penguins to South America – it is where they all came from.
Suddenly the equatorial warm will reach the whole planet – 3oC sea water flowing to the South Pole. Though probably we will have to stop any new ice cap forming.
It is cold, and not warm that is the greatest shortage on planet Earth today. The equator get colder – for free. More lush and fertile – the plants will love it: though some planting of seed in mud we have dredged up from the sea beds may help.
So a cooler equator, and warmer Poles: so we need to mill the ice from the North Pole, and drop it in the spring and summer sea water.
Making a better world – full of more life. AS far as we can tell, there was no South Pole in the Early Cretaceous – when there was 65% more life on Earth. And sea levels 60 metres lower.