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Ko ngā kaiwhakarewa pōhau he tāpoi matua hoki he kaiwhakarewa hanga hou, ā, ko te uara matua o ngā kaiwhakarewa pōhau he whakarewa i ngā tuararu e toru matua o ngā tikanga hanga kawenga. I te tirohanga kounga hanga, he nui te tūpono o te whakarewa ā-ringa i te pōhau ki te whakaputanga i ngā wāhi iti kore tōtika, ka tūkino tika ki te haumaru o te hanganga. Ko ngā kaiwhakarewa kainaha e whakaponoa ana e ngā pūnaha whakarewa e hāngai ai te katoa o te pōhau. Kua whakamātuaia e te wānanga o Michigan, ko te kaha o te whakapaku he 32% ake i te pōhau ā-ringa—ko te whirinakitanga o te hanga pūkenga tēnei he tīapua haumaru mō ngā kaupapa matua pērā i ngā tōwhe me ngā wharepaku teitei.
I ngā take o ngā painga eonomika, ko ngā kaiwhakarewa he whakarere i te whakarite tikanga o ngā utu. Kua whakaatuhia e ngā raraunga a te umanga ko ngā utu mahi e 40% te wāhi e noho ana i te utu o ngā kaupapa concrete, i te wā e tino whakakapi ai tētahi kaiwhakarewa i te mahi e ono ngā kaimahi. Ko tēnei whakarere i te mahi e whai ana i ngā painga e rua: he 87% te whakaiti i te wā e tuku ana i te rōpū (5 meneti ki te 45 meneti ake i mua), me te whakauru i te $2,800 i ia kaupapa (e tāroa ai i te āki ki ngā kaihoko o Amerika). Ko ngā painga hui tahi o tēnei taputapu he nui ake te māroa ki ngā kaupapa nui. Hei tauira, kua tuhia ki te kaupapa Hoover Dam kua iti ake te maha o ngā kaimahi e hiahiatia ana mai i te 4,200 ki te 1,200.
Whai tirohanga whakatipu ahumahi, kua eke ngā kaitīra kaha ki te pakanga tāone whakatipu i ngā whaitua hanga. Āwhina i ngā kāea takotoranga 3.5 kūpata hōu i ngā kainoho kia oti ai ngā whakapai ake i te kāinga ki te taha, ā, kātahi ka āwhina i ngā taputapu 12 kūpata huinga ki te hanga huarahi hou. Kua whakatū ake tēnei whirhwehe i te huringa ahumahi—i muri i te Pakanga Ao Tuarua, i te nuinga o ngā whare i te United States i piki ake ngā tāone takotoranga 214% nā te whānuitanga o ngā kaitīra (raraunga mai i te U.S. Census Bureau). I te wā anō, kei te haere tonu te whakatipu hangarau ki te mātauranga matāpuna: kua whakakorea ngā pūnaha whakahaere whakarewa tika i ngā pōro wāriu (te take matua i ngā pakaru o te kōnukunuku), ā, kua whakapai ake ngā tikanga tīra kia whai wāhi ai ngā rauemi hua tārua, kia āwhina ai i te kōnukunuku i te nuinga o ngā polimeri, neke atu rānei kia eke ki te kaha e waru ngā neke ake.
Ko ngā whakawhirinakitanga taiao he mea māmātia i te nuinga o te wā engari he tino whakapāingia ana. Ki te tātai ki te 17% kohinga pāngarau ki te tāone i te nekehanga o te pōrota kua whakaurua, he iti ake te pāngarau o ngā rauemi ki te puna te whakauru i te wā e hiahiatia ana. Ko ngā tauira hou ake i te hiko he kaiarahina i te huringa kākāriki: raro i ngā tikanga hou a EU mō ngā whakaputanga karaihana, i inea e tētahi kaihanga Tiamani ana ko te kohinga karaihana o tana tauira hiko i te 54% ake i ngā tauira taru.