MunaGunyana, iyo Pacific Northwest Research Station yakaburitsa mushumo wayo "Kuverengera iyo Green muGreen: Chii chinonzi Urban Tree Worth?". Tsvagiridzo yakapedzwa muSacramento, CA uye Portland, OR.
Geoffrey Donovan, nyanzvi yekutsvagisa nePNW Research Station, akafunga kuti miti yakasimwa kumaodzanyemba nekumadokero kwedzimba dzeSacramento yakaderedza mabhiri emagetsi ezhizha neavhareji yemadhora makumi maviri neshanu. Muchidzidzo chechipiri muPortland, boka raDonovan rakaona kuti miti yemugwagwa inokura pamberi kana pedyo neimba yakawedzera avhareji yemadhora 25.16 kumutengo wayo wekutengesa uye yakaderedza nguva yayo pamusika neanenge mazuva maviri. Aya mabhenefiti ehupfumi akadururirwa kune zvivakwa zvevavakidzani: muti wemunharaunda uchikura munzira yeruzhinji-ye-nzira yakawedzera avhareji yemadhora gumi nemaviri nemakumi masere nemasere kune kukosha kwakabatanidzwa kwedzimba dzese mukati me8,870 tsoka.
Unogona kuverenga chidzidzo chakazara pano.