This puts in context any claims that 20th century warming is somehow unusual and alarming. It is not – it is business as usual for earth’s climate.
Discoveries in the ice reveal our planet’s fluctuating, never static, climate history
During WW2 a macabre find was made 16,000 feet up in Indian mountains – a lake full of corpses. Later scientific analysis would date them to the 9th century AD – at the start of the Medieval Warm Period about 1000 years ago. They had been killed by large hail-stones.
What is interesting about this is that the lake corpses had remained hidden in ice for the several centuries of the intervening Little Ice Age, only emerging part of the year from ice in the current warm period – in 1942. More evidence – for those with eyes to see – of climate oscillation over the period of a thousand years.
Another story of death in the ice came more recently from Siberia. In 2016 there was an outbreak of the deadly bacterial disease anthrax among reindeer and their herders in Siberia. It was not from human weaponised pathogens, but a natural event. A reindeer had died of (natural) anthrax 75 years ago and its body was iced over, only to be thawed out in 2016.
This shows once again a window on natural climate oscillation, this time the approximately 60 year wavelength of the ocean driven Atlantic Multidecadal oscillation.
Climate oscillates naturally over a range of different timescales. Such fractal-like behaviour with time is to be expected of a dynamic and complex chaotic system. This puts in context any claims that 20th century warming is somehow unusual and alarming. It is not – it is business as usual for earth’s climate.