Is it theoretically possible to build a long sea wall to join South America and Antarctica across Drake Passage therefore blocking Antarctic Circumpolar Current, allowing warmer sea water to reach Antarctica, hence making Antarctica with a milder climate and somewhat more habitable like current Arctic region and Antarctica once was — when it was still connected to South America millions of years ago, ACC hadn’t formed and even had forests?
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Not possible
a) too long 600miles
b) too deep 15,000 feet deep ocean
c) terrible weather conditions for any sort of construction
d) lots of ice would be melted and this would worsen the climate crisis, if nothing else.
It is likely far easier to construct a huge canal and flood vast areas of the Sahara desert to form more inland seas. Much more area made habitable. And it is believed that more than 10,000 years ago, that area might actually have been that way. Of course, there would be impact to the planet as well.
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