

the sahara turning fully green could actually be another kind of disaster - parts of the food chain rely on dust from the sahara blowing over the atlantic to provide essential nutrient/minerals for smaller organisms that slightly less small organism feed on.
https://www.popsci.com/environment/sahara-dust-atlantic/
migrating dust clouds originating in the Sahara Desert are crucial to fostering life in the Atlantic Ocean as far away as the Amazonian basin
at least its self-pruning