Michael Hart, umuturage wa San Diego, yashinjwe kurenga ku mabwiriza ya leta ya Amerika agamije kugabanya ikoreshwa ry'imyuka ihumanya ikirere. Ni ibinyoma kwinjiza hydrofluorocarbons (HFCs) nta byangombwa bidasanzwe byatanzwe n'Ikigo gishinzwe kurengera ibidukikije (EPA). Hart arashinjwa kugura ibicuruzwa bikonjesha muri Mexico no kubikwirakwiza muri Amerika abinyegeza munsi y'urukuta n'ibikoresho.