Sunday, 5 February 2023

Octopus Clock Countdown?

The melting of the Antarctic Ice Sheet would add 3-4 metres to sea level. This would have devastating effects on human populations, largely clustered around the planet's coasts. It's consequently important to assess whether the Antarctic Ice Sheet is likely to melt. Scientists are getting an answer to this key question, from a very unlikely source (https://www.theguardian.com/world/2023/feb/05/clue-to-rising-sea-levels-lies-in-dna-of-4m-year-old-octopus-scientists-say). The last time the Earth was as hot as it now is, was some 125,000 years ago. Turquet's octopus has lived around the Antarctic Ice Sheet for around 50 million years. Geneticists have now studied the genes of 96 of these octopii, collected over 30 years, from around Antarctica. Their data suggests that populations from opposite sides of the West Antarctic Ice Sheet, mingled around 125,000 years ago. This is only likely to have occurred, if that Ice Sheet had melted, creating a seaway between the south Weddell and Ross seas. Yet another indication of the apocalyptic consequences of climate change!

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