By digging such pits, people in Arusha, Tanzania, have managed to transform a desert area into a grassland https://t.co/N5dBP2Ypze https://video.twimg.com/ext_tw_video/1850836312112128000/pu/vid/avc1/360x640/vAlyKq3i_ArxX7x1.mp4?tag=12