5000 years ago Sahara was a green landscape with lakes and rivers
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Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#2Twitter is such a terrible way of displaying long form content like this.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#3We need to ACT NOW to stop climate change! We should all be like greta thurnburg who is so inspiring in her multi million dollar yacht. Ban cows! Also, obligatory orange man bad, reeeeeeee.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#4Changes in the earth's orbit known as its orbital precession, a change in tilt that cycles every 25,000 years, forced the African monsoon rains southward, and the Sahara became drier.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#5Is this suggesting that modern civilization started with climate change? At the end, he points out that the occupants of these areas moved towards the coasts during the desertification. This would have been immediately preceding the establishment of the first Egyptian dynasty.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#6Changes in the earth's orbit known as its orbital precession, a change in tilt that cycles every 25,000 years, forced the African monsoon rains southward, and the Sahara became drier. https://en.wikipedia.org/wiki/Apsidal_precession https://en.wikipedia.org/wiki/Milankovitch_cycles
See also:
* https://en.wikipedia.org/wiki/Axial_precession
Because of this precession ("wobble"), it turns out that the "North Star" has not always been Polaris. Back when the Pyramids were built in ancient Egypt north pointed to Thuban.
The Hoover Dam actually has a monument that gives the year it was built using this astronomical fact:
* https://blog.longnow.org/02019/01/29/the-26000-year-astronom...
* https://grahamhancock.com/motlochw1/
* https://www.quora.com/At-the-Hoover-Dam-what-is-the-meaning-...
* https://kottke.org/19/02/the-hoover-dams-hidden-26000-year-a... (via)
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#7Is this suggesting that modern civilization started with climate change? At the end, he points out that the occupants of these areas moved towards the coasts during the desertification. This would have been immediately preceding the establishment of the first Egyptian dynasty.
Indeed. This is also mentioned at the start of the related podcast episode (see https://itunes.apple.com/gb/podcast/fall-of-civilizations-po...)
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#8Twitter is such a terrible way of displaying long form content like this.
It's a good teaser for the podcast, I thought. The last episode (ep 7, which covers this topic) is more than 2 hours long. It's pretty great.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#9Twitter is such a terrible way of displaying long form content like this.
You beat me to it. I find this subject interesting but the platform of Twitter is incredibly ill-fitting for this. I've noticed recently more and more people doing long-form content on Twitter - I hope it's not a trend that catches on.
Re: 5000 years ago Sahara was a green landscape with lakes and rivers
#10Twitter is such a terrible way of displaying long form content like this.
I was just on my way to post the ThreadreaderApp link.
Here you go: