E boro Michael Hart, onye bi na San Diego, ebubo na ọ dara iwu gọọmentị US nke ezubere igbochi iji gas na-ekpo ọkụ. Ọ bụ iwu na-akwadoghị ịbubata hydrofluorocarbons (HFCs) na-enweghị ikike pụrụ iche nke Ngalaba Nchedo Gburugburu Ebe Obibi (EPA) nyere.
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