Michael Hart, wokhala ku San Diego, anaimbidwa mlandu wophwanya malamulo a boma la US omwe cholinga chake ndi kuletsa kugwiritsa ntchito mpweya wowonjezera kutentha. Ndizosaloledwa kuitanitsa ma hydrofluorocarbons (HFCs) popanda chilolezo chapadera choperekedwa ndi Environmental Protection Agency (EPA) Hart akuimbidwa mlandu wogula ma refrigerants ku Mexico ndikuwagulitsa ku US powabisa pansi pa tarpaulin ndi zida.