Climate troubles for scotch, water & Bitcoin (rebroadcast)

As the climate heats up, we hear about the dry future predicted for one of Scotland's best known exports. We travel to East Africa, where Somalians — desperate for climate aid — are taking the salt out of seawater to solve worrisome water shortages. We also ask how — indeed, if — clean Bitcoin could fix the currency's carbon footprint, and learn how to zap the methane out of cow dung.