347 (Audio): Public media must not lie. Battery bestiary. Green walls. Hunger ⬇️

This week: two great green walls — one in China, one in Africa — slowly learning to hold back the desert after decades of failure. Hungary's state broadcaster apologising, on air, for lying. The world's fastest spider, clocked with a paintbrush. Global hunger falling for a third year running. And a deep dive into the weird and wonderful world of long-duration batteries — iron-air, compressed air, liquid air, sand, gravity, and more — quietly solving one of clean energy's hardest problems.