Great Green Wall of Africa Darker green areas need more work, light green areas need less work. Click on map to embiggenate |
The idea is to plant a wall of trees 10 miles wide clear across the continent of Africa along the southern border of the Sahara desert. The idea was originally proposed back in the 1950's.
Notice that there are a bunch of rivers below the line of demarcation, the only river above the line is the Nile.
Wikipedia has an article.
Via Reddit
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