The “Sahara dried out slowly, not abruptly“, according to a Reuters report of a new article by Kropelin et al., published in Science. That would be good news on its own, first as it means abrupt climatic changes happen not as often as once feared; and second, because it indicates climate was changing in an area the size of the United States, between 6,000 and 2,700 years ago (the latter date, coinciding with the legendary foundation of Rome).
Obviously, with no SUVs polluting at the time of Romulus, the end result is…more evidence that if anything is happening right now, is not necessarily the fault of us environmental sinners.
But the really good news is buried at the end of the piece:
[Kropelin] said there were already greener signs in a huge area with almost no reliable weather records. “I see a clear trend to a new greening of the Sahara, a very slow one,” he said, based on visits to some of the remotest and uninhabited parts of the desert over the past two decades. “You go to unoccupied areas over a long time and you know there was pure sand there without a single snake or scorpion. Now you see tens of kilometers covered by grass,” he said.
Finally! Some actual albeit initial evidence that warming is occurring indeed, and not just in continuously-corrected temperature measurements: because a warmer world is a wetter world, for the same reason why a colder world is a drier world, with all that water locked up in ice.
And what is a warmer and wetter world, if not a greener world?