2. Wāhanga whakakī:
● Mīhini whakakī me ngā taputapu hiki mīhini momo-puna hei whakapai ake i ngā pounamu karāhe, he tautoko whāriki nui e rere ana i roto i te oko me te whakamahi i te tokotoko ārahi i roto i te whakatakotoranga o te hanganga, kei reira ngā āhuatanga taupoki-mua.
● Ka whakamahia ngā takirere whakakī ngongo roa, ka whakawhiti katoatia te CO2 me te hau i roto i ngā pounamu karāhe, ka whakahaerehia te taumata wai o te rango me te pēhanga whakamuri e te tohu rerekē o te ōwehenga. He tere, he pumau, he tika, ka taea te whakakore takitahi.