Abrupt, dramatic climate changes happen naturally. Scientists find Sahara went from green to parched in just a matter of decades.
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The claim that human emissions are causing the climate to change dramatically and abruptly is used to instill fear among the population. Without human emissions, the climate would still change, but much more calmly and gradually, so they like to have us believe.
But anyone who has studied climate history knows that climate change tends happen abruptly, often over the course of just a few decades.
One example is the Sahara, which wasn’t always a desert. Trees and grasslands dominated the landscape from roughly 10,000 years ago to 5,000 years ago, scientists reported in a paper published in 2013. “Then, abruptly, the climate changed, and north Africa began to dry out.”
The study published in Science says it all took just a few hundred years.
According to the authors: “Our analysis suggests that the termination of the African Humid Period in the Horn of Africa occurred within centuries, underscoring the non-linearity of the region’s hydroclimate.”
The Saharan shift is thought to have been initially triggered by more sunlight falling on Earth’s northern hemisphere, as Earth’s cyclic orientation toward the sun changed. It had nothing to do with CO2 emissions and human activities. It was all natural.
Man has an impact, but the real change is still very much natural and is still very poorly understood today. Performing weather-alteration rituals won’t make Mother Nature tamer.
“Then, abruptly, the climate changed, and north Africa began to dry out.”
The term abruptly means the we humans do not have a clue…. The earth obliquity changes but slowly and gradually so some something else on/in the earth could play a role.
Earth obliquity changes also abruptly. The Sahara event was an obliquity reduction, from some 20deg to about 14deg. Date about 3559 bce.
Time/duration of event: a few hours
Effect on Sahara: a few decades.
thank you
Read and see it here:https://archive.aramcoworld.com/issue/201403/last.lakes.of.the.green.sahara.htm
Man has no impact. To believe otherwise is hubris.
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Dr Horst-Joachim Lüdecke may have a different stance on this subject.
A debate between the scientists who claim that the climate in Sahara evolved abruptely (in a few centuries) and those who claim that it evolved in some millenia would be very interesting.
The return to desert involves El Nino conditions, which became more frequent and intense from around 5200 years ago. Stages of more rapid desert expansion happened during grand solar minima from 2225 BC and 2000 BC, because El Nino episodes were more frequent and intense during the low solar periods. They are referred to as ‘aridity events’.
The 4.2 ka BP climatic event
https://cp.copernicus.org/articles/special_issue958.html
See dates here; all linked to the 980yr Eddy cycle
https://www.pbslearningmedia.org/resource/014e344c-14dd-465d-bc68-69c80c94fd81/skeletons-of-the-sahara-part-2/
At 0:49 in video.