The half-circles are called zaï! They're a traditional farming practice in the Sahel desert, and their introduction + reintroduction can be largely credited to Yacouba Sawadogo, the man linked above! He reintroduced and innovated on the zaï on his own farm in the 1980s, and did extensive outreach (along with scientist Mathieu Ouédraogo) to encourage other farmers to adopt them as well.

He also promoted the use of cordons pierreux, which are basically just lines of rocks to reduce erosion, preserve sediments, and increase water absorption.

friend 1: just folded laundry for 3 hours 😊

friend 2: i think my stomach wall is eroding guys idk what to do

friend 3: have u seen a doctor yet???

friend 2: well nooo...

friend 4: someone is at my door 😰

friend 1: just cleaned the sinks and toilets 😍

friend 2: no really the light is fading from my eyes

friend 4: a tree fell on my neighbor

you: just got off work is anybody free