Scotch whisky, drinking seawater & the 'green Bitcoin' wave (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.