National Geographic says that warm climates are good and cold climates are bad.

The Vikings settled Greenland during a period of exceptional warmth, the same warm period that saw expanded agriculture and the construction of great cathedrals in Europe. By 1300, though, Greenland became much colder, and living there became ever more challenging. Changing Greenland – Viking Weather – National Geographic Magazine

In the same paragraph they say that a warmer climate is a threat

The demise of those tough, seafaring farmers offers an unsettling example of the threats climate change poses to even the most resourceful cultures.

Meanwhile Greenland is frozen solid and stuck below freezing – on June 8

Vikings couldn’t survive now, because it is too cold to farm. But Michael Mann says there never was a Medieval Warm Period, and the climate is much warmer now.

Nothing alarmists believe makes any sense, but they are afraid to think for themselves, because they believe other people can see the Emperor’s New Clothes.