Butglobally, over 2 billionpeople – around a quarteroftheworld's population – liveinwater-stressedcountries, whereaccesstowaterfordrinking, cookingandwashingisnotguaranteed. What's more, waterisalsoneededtogrowfoodandthat's gettingharderduetodroughts, whichareincreasingwithclimatechange.
Inthisprogramme, we'llvisitfarmersinoneofthedriestplacesonearth – YumaintheUSA – where a newtechnologyinvolvingliquidclayishelpingfarmersgrowfruitandvegetablesinthedesert. Andasusual, we'llbelearningsomeusefulnewvocabularytoo.
Butfirst, I have a questionforyou, Neil. Everyoneknowsthatplantsneedsunlightandwatertogrow, butsoilisjustasimportant. Oneofthemostusefulsoilsisclay – a dense, smoothsoilwhichisveryfertilebutsticky.
Fortunately, Ole's teamhavecreated a liquidthat, theysay, canturnthesandydesertsoilinto a spongewhichholdswaterandnutrients. HereheexplainshisinventiontoAnthony
ウォレス、BBCワールドサービスの番組『People Fixing the World』のレポーター。
Tounderstandhowitworks, weneedtolookatthedifferencebetweensandysoilandclaysoil. Sandydesertsoilhas a lotofgapsinit, sowaterdrainsthroughitquickly, makingitharderforplantstoestablish a rootsystemintheground. Butclaysoilismadeupofmuchsmallerparticlesthatclingtogetherandnaturallystopwaterfromescaping.