He tino nui te whakamahinga hiko o te hanga konupūmā kāpira, nō reira ka puta he wero ki te tuku hiko o Haina. Nā te mea ka puta te hiko mā te tahu waro, me nui te waro e pau ana, nō reira ka poke te āhuarangi i te tahunga o te waro. Heoi, kua huri haere ngā kaupapa here a Haina i ngā tau kua pahure. Kei te whakapai tonu a Haina i tana mekameka ahumahi. Ināianei ka kite tātou kua kawemai a Haina i te nui o te hinu, ā, kei te akiakihia ngā umanga ā-rohe ki te kawemai i te hinu hei whakapai ake i ngā hua o raro. Nō reira, i ngā tau tata nei, kua tāpirihia he maha ngā kaihanga tukanga ethylene hou ki Haina, ā, ko te kaha whakaputa PVC hou katoa i Haina i ngā tau tata nei ko te kaha whakaputa o te tukanga ethylene. Kua mutu te whakaaetanga hou mō te kaha whakaputa o te tikanga konupūmā kāpira a Haina. Nō reira, i roto i ngā tau tata nei, ka piki haere tonu te maha o ngā tipu ethylene i Haina, ā, ka heke haere tonu te tukanga konupūmā kāpira. I ngā tau kei te heke mai, ka piki haere tonu te nui o te kaweake o te tukanga ethylene a Haina, ā, ka noho hei kaihokohoko matua o te ao mō te tukanga ethylene PVC.
