NgoJanuwari ka-2010, iToronto yaba idolobha lokuqala eNyakatho Melika ukudinga ukufakwa kophahla oluluhlaza ekuthuthukisweni okusha kwezentengiselwano, izikhungo, kanye nemindeni eminingi edolobheni lonke. Ngesonto elizayo, imfuneko izokhula ukuze isebenze nasekuthuthukisweni kwezimboni ezintsha.

Kalula nje, ¡°uphahla oluluhlaza ¡± wuphahla olunohlaza. Uphahla oluluhlaza lukhiqiza izinzuzo eziningi zemvelo ngokunciphisa umphumela wesiqhingi sokushisa sasemadolobheni kanye nesidingo samandla esihlobene, ukumunca amanzi emvula ngaphambi kokuba ageleze, kuthuthukiswe ikhwalithi yomoya, nokuletha imvelo nokuhlukahluka kwemvelo ezindaweni zasemadolobheni. Ezimweni eziningi, uphahla oluluhlaza lungabuye lujatshulelwe umphakathi njengoba ipaki lingaba.

Izimfuneko zase-Toronto ziqukethwe emthethweni kamasipala ohlanganisa izindinganiso zalapho kudingeka uphahla oluluhlaza nokuthi yiziphi izici ezidingekayo ekwakhiweni. Ngokuvamile, izakhiwo zokuhlala ezincane nezohwebo (ezifana namafulethi angaphansi kwezitezi eziyisithupha ubude) zikhululekile; ukusuka lapho, uma isakhiwo sikhulu, ingxenye yophahla kufanele ibe nkulu. Emabhilidini amakhulu kunawo wonke, amaphesenti angama-60 wendawo etholakalayo ophahleni kufanele kube nemifino.

Ezakhiweni zezimboni, izidingo azinzima kangako. Umthetho kamasipala uzodinga ukuthi amaphesenti ayi-10 ezindawo zophahla ezitholakalayo ezakhiweni ezintsha zezimboni zikhavwe, ngaphandle uma isakhiwo sisebenzisa ¡°izinto zokufulela ezipholile¡± ngamaphesenti angu-100 wendawo yophahla etholakalayo futhi sinezinyathelo zokugcina amanzi eziphepho ezanele ukubamba amaphesenti angu-50 emvula yonyaka ( noma ama-mm amahlanu okuqala emvuleni ngayinye) esizeni. Kuwo wonke amabhilidi, ukwehluka ekuthotshelweni kwemithetho (isibonelo, ukumboza indawo enophahla oluncane enezitshalo) kungase kucelwe uma kuhambisana nezindleko (ezifakwe kukhiye wosayizi wesakhiwo) ezitshalwe ezinzuzweni zokuthuthukiswa kophahla oluluhlaza phakathi kwabanikazi bezakhiwo abakhona. Ukwehluka kufanele kunikezwe uMkhandlu weDolobha.

Inhlangano yezimboni iGreen Roofs for Healthy Cities imemezele ukuwa kokugcina esitatimendeni sabezindaba ukuthi izidingo zophahla oluluhlaza zase-Toronto zase ziholele kumamitha-skwele angaphezu kwesigidi esingu-1.2 (amamitha-skwele angu-113,300) esikhala esisha esiluhlaza esihlelelwe ezohwebo, izikhungo, kanye nemindeni eminingi. ukuthuthukiswa kwezindawo zokuhlala edolobheni. Ngokusho kwenhlangano, izinzuzo zizobandakanya imisebenzi yesikhathi esigcwele engaphezu kuka-125 ehlobene nokwakhiwa, ukuklama, ukufakwa nokugcinwa kophahla; ukuncishiswa kwamanzi emvula angaphezu kuka-435 000 (anele ukugcwalisa amachibi okubhukuda angange-Olympic angaba ngu-50) unyaka ngamunye; nokonga amandla ngonyaka angaphezu kwesigidi esingu-1.5 KWH kubanikazi bezakhiwo. Uma uhlelo lusebenza isikhathi eside, izinzuzo zizokwanda kakhulu.

Isithombe se-triptych ngenhla sathuthukiswa izitshudeni zaseNyuvesi yaseToronto ukuze zibonise izinguquko ezingaba khona kusukela eminyakeni eyishumi yenqubekela phambili ngaphansi kwezidingo zedolobha¡¯s. Ngaphambi kwalo mthetho kamasipala, iToronto yayingeyesibili phakathi kwamadolobha aseNyakatho Melika (ngemuva kweChicago) enanini layo eliphelele lokumbozwa kophahla oluluhlaza. Ezinye izithombe ezihambisana nalokhu okuthunyelwe (hambisa ikhesa yakho phezu kwazo ukuze uthole imininingwane) zibonisa uphahla oluluhlaza ezakhiweni ezihlukahlukene zase-Toronto, okuhlanganisa nephrojekthi yombukiso efinyeleleka esidlangalaleni ku-City Hall¡¯s podium.