Vän av ordning undrar hur man kunde leva på Richartformationen, det ser ju ut att vara öken. Men kan miljön ha ändrats under historisk tid? Om så är fallet hur kan man veta det, datormodeller el vad:https://www.space.com/10527-earth-orbit ... ahara.html
"The findings of this study are that the sedimentological and geochemical properties of the lake sediments confirm that the Sahara has been drying slowly from six thousand years ago to reach the present day conditions around 1,100 years ago,"
"There is now considerable evidence to show that the Sahara used to have a grassland ecosystem and was a much wetter place than it is now. However, the debate about how that transition occurred continues. The disagreement among scientists is in part due to the lack of paleo-environmental records from the region. Therefore, scientists must often resort to climate modeling."