O Michael Hart, o se tagata o San Diego, na molia i le solia o tulafono a le malo o Amerika e faʻatatau i le faʻaaogaina o kasa oona. E faʻatulafonoina le faʻaulufaleina o hydrofluorocarbons (HFCs) e aunoa ma ni faʻatagaga faʻapitoa na tuʻuina mai e le Ofisa o Puipuiga o le Siosiomaga (EPA) Hart ua molia i le faʻatauina o mea faʻaalu i Mexico ma faʻatau faʻatau atu i le US e ala i le nanaina i lalo o se tarpaulin ma mea faigaluega.