Michael Hart, d yiwen n umezdaɣ n San Diego, yettwaḥaseb ɣef tuccḍa n yilugan n udabu n Marikan i d-yettunefken i useqdec n igza n tnezduɣt. D ayen ur nezmir ad d-nawi i yiḥidrofluworukarbuniyen (HFC) mebla tizemmar i d-tefka Tuddsa n Uḥuddu n Yigwan (EPA).
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