NgoJanuwari ka-2010, iToronto yaba sisixeko sokuqala kuMntla Melika ukufuna ukufakelwa kophahla oluluhlaza kuphuhliso olutsha lwezorhwebo, lweziko, kunye neentsapho ezininzi kwisixeko sonke. Kwiveki ezayo, imfuneko iya kwanda ukuze isebenze kuphuhliso olutsha lwemizi-mveliso ngokunjalo.

Ngamafutshane, ¡°uphahla oluluhlaza¡± luphahla olutyaliweyo. Uphahla oluluhlaza luvelisa izibonelelo ezininzi zokusingqongileyo ngokunciphisa isiphumo sesiqithi sobushushu sasezidolophini kunye nemfuno yamandla ehambelanayo, ukufunxa amanzi emvula ngaphambi kokuba abaleke, kuphuculwe umgangatho womoya, kunye nokuzisa indalo kunye nendalo eyohlukileyo kwimo engqongileyo yasezidolophini. Kwiimeko ezininzi, uphahla oluluhlaza lunokonwatyiswa luluntu njengokuba ipaki inokuba njalo.

Toronto¡¯s iimfuno ziqulethwe kumthetho kamasipala obandakanya imigangatho xa uphahla eluhlaza kufuneka kwaye zeziphi izinto ezifunekayo kuyilo. Ngokubanzi, izakhiwo ezincinci zokuhlala kunye nezorhwebo (ezifana nezakhiwo zokuhlala ezingaphantsi kwemigangatho emithandathu ubude) zikhululekile; ukusuka apho, ubukhulu besakhiwo, isahlulo sezityalo sophahla kufuneka sibe sikhulu. Kwezona zakhiwo zikhulu, ama-60 ekhulwini eendawo ezifumaneka eluphahleni kufuneka zibe nezityalo.

Kwizakhiwo zoshishino, iimfuno azikho mfuneko. Umthetho kamasipala uya kufuna ukuba i-10 lepesenti lendawo yophahla ekhoyo kwizakhiwo ezitsha zemizi-mveliso igqunywe, ngaphandle kokuba isakhiwo sisebenzisa ¡°izinto ezipholileyo zokufulela¡± nge-100 lepesenti yendawo yophahla ekhoyo kwaye sinamanyathelo okugcina amanzi esiphango awaneleyo ukubamba ama-50 ekhulwini emvula yonyaka ( okanye iimm ezintlanu zokuqala ukusuka kwimvula nganye) kwisiza. Kuzo zonke izakhiwo, iiyantlukwano zokuthotyelwa (umzekelo, ukugquma indawo yophahla oluncinane kunye nezityalo) zinokucelwa ukuba zikhatshwa yimirhumo (efakwe kwisitshixo sobukhulu besakhiwo) etyalwe kwinkuthazo yophuhliso lophahla oluluhlaza phakathi kwabanini bezakhiwo abakhoyo. Iiyantlukwano kufuneka zinikwe liBhunga leSixeko.

Umbutho woshishino iGreen Roofs for Healthy Cities ubhengeze ukuwa kokugqibela kwingxelo yeendaba ukuba iimfuno zophahla oluhlaza zaseToronto sele zibangele ngaphezulu kwe-1.2 yesigidi seemitha zesikwere (113,300 square metres) yendawo entsha eluhlaza ecetywayo kurhwebo, kwiziko, nakwi-multifamily. uphuhliso lweendawo zokuhlala esixekweni. Ngokutsho kombutho, izibonelelo ziya kubandakanya imisebenzi engaphezulu kwe-125 yexesha elizeleyo ehambelana nokuveliswa, ukuyila, ukufakwa kunye nokugcinwa kwamaphahla; ukuncitshiswa kwamanzi angaphezu kwama-435 000 eekyubhiki mitha zamanzi emvula (anele ukuzalisa amadama okuqubha amalunga nama-50 alingana neOlimpiki) nyaka ngamnye; kunye nokonga amandla ngonyaka ngaphezulu kwe-1.5 yezigidi ze-KWH kubanini bezakhiwo. Okukhona inkqubo isebenza ixesha elide, kokukhona izibonelelo ziya kwanda.

Umfanekiso we-triptych ongentla waphuhliswa ngabafundi beDyunivesithi yaseToronto ukubonisa utshintsho olunokuthi lwenzeke kwiminyaka elishumi yenkqubela phambili phantsi kweemfuno zesixeko¡¯s. Ngaphambi kwalo mthetho kamasipala, iToronto yayiyeyesibini phakathi kwezixeko zaseMntla Melika (emva kweChicago) kwisixa sayo esipheleleyo sophahla oluluhlaza. Eminye imifanekiso ekhapha esi sithuba (susa ikhesa phezu kwayo ukuze ufumane iinkcukacha) ibonisa uphahla oluluhlaza kwizakhiwo ezahlukeneyo zaseToronto, kuquka neprojekthi yomboniso efikelelekayo esidlangalaleni kwiqonga leHolo yeSixeko.