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I had seen a video somewhere that the Green Great Wall was failing and in constant threat of collapse because of the arid wind and pretty much non-existent water table causing the trees to die off faster than they can be planted.

The footage had interviews with a group that tries to keep it watered.

EDIT: It might have been the initiative in Africa (Sahara). I tried finding the video and am met with similar initiatives on both continents.



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