V tokratnem ARŠU se bomo posvetili snovem oz. materialom, ki so se v nekem obdobju ponujali kot inovativne rešitve za kompleksne probleme in se je tako njihova uporaba hitro razširila, vendar pa se je kasneje izkazalo, da nov material povzroča nepredvidljive okoljske težave. Odgovorili bomo na kakšen način se kot družba spopadamo s temi škodljivimi snovmi, ko se zavemo njihove škodljivosti za okolje ali zdravje oz. ko postanejo nesprejemljive za nadaljnjo uporabo. Zakaj številni materiali, katerih škodljivost je dobro poznana, še vedno vztrajajo, zakaj jih zamenjujemo počasi in pogosto z neugodnimi alternativami in zakaj se jim preprosto ne odrečemo? 

V oddaji smo se osredotočili na hladilne tekočine. Nekoč so bile to strupen amonijak, koroziven žveplov dioksid in manj strupen vendar tudi manj učinkovit ogljikov dioksid. Freoni so se v petdesetih letih prejšnejga stoletja pojavili kot skoraj idealni nadomestki, vendar pa se je izkazalo, da krčijo zelo pomembno ozonsko plast. Kako smo ta problem kot družba poskusili rešiti in ali imamo sploh dobre nadomestke freonom? Kako je na to vplivala industrija in kako odločevalci? Ali je bil Montrealski protokol uspešen pri zmanjševanju koncentracije freonov v atmosferi in ali se ozonska luknja "celi"?

 Prisluhnite novi epizodi ARŠA v četrtek, 11. septembra 2025, ob 19h, samo na valovih Radia Študent.

Fotografija: Animacija upada koncentracije ozona, če ne bi sprejeli Montrealskega protokola, ki je prepovedal proizvodnjo in uporabo freonov. 

Vir fotografije: Animated image of the change in ozone concentration in the atmosphere between layers, NASA/Goddard Space Flight Center Scientific Visualization Studio, licenca CC 4.0

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