NgoJanuwari ka-2010, iToronto yaba idolobha lokuqala eNyakatho Melika ukudinga ukufakwa kophahla oluluhlaza ezakhiweni ezintsha zezentengiselwano, zezikhungo, kanye nezemindeni eminingi kulo lonke idolobha. Ngesonto elizayo, isidingo sizokhula sisebenze nasekuthuthukisweni kwezimboni ezintsha.

Kalula nje, uphahla oluhlaza okwesibhakabhaka ¡° luphahla olunezitshalo. Uphahla oluluhlaza lukhiqiza izinzuzo eziningi zemvelo ngokunciphisa umphumela wokushisa kwesiqhingi sasemadolobheni kanye nesidingo samandla esihambisanayo, lumunce amanzi emvula ngaphambi kokuba ageleze, luthuthukise ikhwalithi yomoya, futhi lulethe imvelo kanye nokwehlukahluka kwemvelo ezindaweni zasemadolobheni. Ezimweni eziningi, uphahla oluluhlaza lungajatshulelwa umphakathi njengoba nje nepaki lingajatshulelwa.

Izidingo zaseToronto zifakwe emthethweni kamasipala ohlanganisa izindinganiso zokuthi uphahla oluhlaza ludingeka nini nokuthi yiziphi izinto ezidingekayo ekwakhiweni. Ngokuvamile, izakhiwo ezincane zokuhlala nezebhizinisi (njengezakhiwo zamafulethi ezingaphansi kwezitezi eziyisithupha ubude) azinazo izakhiwo; lapho, uma isakhiwo sikhulu, ingxenye yophahla enezitshalo kumele ibe nkulu. Ezakhiweni ezinkulu kunazo zonke, amaphesenti angama-60 esikhala esitholakalayo ophahleni kumele sibe nezitshalo.

Ezakhiweni zezimboni, izidingo azidingi kakhulu. Umthetho kamasipala uzodinga ukuthi amaphesenti ayi-10 esikhala sophahla esitholakalayo ezakhiweni ezintsha zezimboni simbozwe, ngaphandle kokuthi isakhiwo sisebenzisa "izinto zokuphahla ezipholile" ezilingana namaphesenti ayi-100 esikhala sophahla esitholakalayo futhi sinezindlela zokugcina amanzi emvula ezanele ukubamba amaphesenti angama-50 emvula yonyaka (noma amamilimitha amahlanu okuqala emvula ngayinye) endaweni. Kuzo zonke izakhiwo, ukuhlukahluka kokuthobela imithetho (isibonelo, ukumboza indawo encane yophahla ngezitshalo) kungacelwa uma kuhambisana nemali (ebalulekile ngobukhulu besakhiwo) etshalwe ezikhuthazweni zokuthuthukiswa kophahla oluluhlaza phakathi kwabanikazi bezakhiwo abakhona. Ukuhlukahluka kumele kunikezwe yiMkhandlu Wedolobha.

Inhlangano yezimboni i-Green Roofs for Healthy Cities imemezele ekwindla edlule esitatimendeni sabezindaba ukuthi izidingo zophahla oluluhlaza lwaseToronto sezivele ziholele endaweni entsha eluhlaza ehlelelwe ukuthuthukiswa kwezindawo zokuhlala zezentengiselwano, zezikhungo, kanye nezemindeni eminingi edolobheni. Ngokusho kwenhlangano, izinzuzo zizofaka imisebenzi yesikhathi esigcwele engaphezu kwe-125 ehlobene nokukhiqiza, ukuklama, ukufaka kanye nokunakekelwa kophahla; ukuncishiswa kwamanzi emvula angaphezu kwama-cubic feet angu-435,000 (okwanele ukugcwalisa amachibi okubhukuda angama-Olympic angaba ngu-50) minyaka yonke; kanye nokonga amandla ngonyaka okungaphezu kwe-KWH yezigidi ezingu-1.5 kubanikazi bezakhiwo. Uma uhlelo lusebenza isikhathi eside, izinzuzo zizokwanda kakhulu.

Isithombe se-triptych esingenhla sakhiwe ngabafundi baseNyuvesi yaseToronto ukuze babonise izinguquko ezingase zivele eminyakeni eyishumi yentuthuko ngaphansi kwezimfuneko zedolobha. Ngaphambi komthetho, iToronto yayingeyesibili phakathi kwamadolobha aseNyakatho Melika (ngemuva kweChicago) ngobuningi bayo bokumbozwa kophahla oluluhlaza. Ezinye izithombe ezihambisana nalesi sihloko (hambisa isikhombisi sakho phezu kwazo ukuze uthole imininingwane) zibonisa uphahla oluluhlaza ezakhiweni ezahlukene zaseToronto, okuhlanganisa nephrojekthi yokubonisa efinyeleleka emphakathini epulatifomu yeHholo Lomuzi.