We can do much better to cure the desert climate on the Northern Sahara.
Set up Small Modular nuclear reactors near the seashore, and use the heat generated by the reactor to distill sea water, collect the resulting water vapor in cooling condensation towers, and pipe the pure and mineral-free water eastward into the arid lands of the the desert. The desert will begin to bloom, and as the number and locations of the nuclear-powered seawater stills are increased, the volume of water being pumped eastward across the desert continues to expand the arable land, eventually reaching Egypt and the Nile River. An enormous green belt is thus established across territory that once served as the bread basket of the Roman Empire, and for a while, the specter of starvation is once again staved off.
There is an awful lot of Sahara desert to be turned back into a green belt, and the resulting change would be overall highly beneficial to mankind, but it may conflict with those for whom an economic model built around scarcity rather than abundance, is their personal path to power and influence.
The sahara has served as a nice deterrent to northern immigration of sub-saharans. I see no reason to change it.
Distillation is very energy inefficient. Reverse osmosis produces almost 10 times as much pure water for the same energy usage. That is why desalination has become affordable despite rising energy costs.
Other than that your ideas are sound.
The sands of the Sahara fertilize the rainforests of South America.
What will your greening of the Sahara have on that?
Nothing exists in isolation.
Humans can’t even properly control life in a single national park.
Nah, makes too much sense. Plus the ‘Big Guy’ wouldn’t get his 10%. either.
It’s MUCH easier than that.
A MASSIVE hunk of the Sahara, taking up huge portions of Libya and Egypt, is well below sea level. (A similar condition exists in the Australian desert.) Build an aquaduct from the ocean under the low ridge that isolates this valley from the ocean. Fill it with power generators the likes of which humanity has never seen. Create a massive salt pan in the Sahara as the water evaporates but adds humidity to the air. Mine the salt pan for lithium and other metals. I thought of this when I saw the topography of the Sahara, but then found that there actually were serious discussions to do this, even before WWII. What a Boring (tm) job.
Geologist have found river beds in the Sahara.