By digging such pits, people in Arusha, Tanzania, have managed to transform a desert area into a grassland https://t.co/FEV5KvpW3c https://video.twimg.com/ext_tw_video/1831784357821833216/pu/vid/avc1/576x1024/b2KUgJvJJNUnoBJU.mp4?tag=12