Michael Hart, omutuuze w'e San Diego, avunaanibwa okumenya amateeka ga gavumenti ya Amerika agalina ekigendererwa eky'okukomya okukozesa emyuka egireeta omukka oguyitibwa greenhouse gases. Kigaana amateeka okuleeta hydrofluorocarbons (HFCs) awatali lukusa olw'enjawulo oluva mu kitongole ekivunaanyizibwa ku kukuuma obutonde bw'ensi (EPA) Hart avunaanibwa okugula ebikozesebwa mu kuziyiza omuliro mu Mexico n'okubitunda mu Amerika ng'abikweka wansi w'ekibira n'ebikozesebwa.