The world is here on Instagram: "In Tanzania, communities have found a simple but powerful way to fight desertification—digging crescent-shaped pits called half-moons. These shallow pits trap rainwater that would otherwise run off, allowing it to seep into the soil. The stored moisture helps seeds germinate and crops grow, gradually restoring vegetation to arid land. Over time, this low-cost technique has turned once-barren landscapes into green, fertile fields, showing how traditional knowledge