Michael Hart, pabbanua San Diego, ri tudangi mappateddeki aturang pamarenta AS iyya makkeguna untu' nahalangi akkegunang gas rumah kaca. iyanaritu de'na ulle ri impor hidrofluoro karbon (HFC) de'na ulle ri ulle ri ulle ri onrong khusus iyya ripassu pole Environmental Protection Agency (EPA) Hart ri tudangi melli refrigerant ri Meksiko nenniya nabbalu'i ri AS sibawa nasubbu i ri yawana tarpaulin nenniya ala'na.