Retreat of White Chuck Glacier, Washington Play media Komawar kankara tun daga 1850 ya shafi samuwar ruwa mai kyau don ban ruwa da amfanin gida, nishaɗin dutse, dabbobi da tsirrai waɗanda suka dogara da narkewar kankara, kuma, a cikin lokaci mai tsawo, matakin tekuna. Masu nazarin glaciologists sunyi nazari, haɗuwa ta lokaci na kankara tare da gwargwadon haɓakar iskar gas mai sau da yawa galibi ana ambata a matsayin hujja mai tushe na ɗumamar yanayi. Yankin tsaunukan tsakiyar latti kamar Himalayas, Rockies, Alps, Cascades, da kudancin Andes, kazalika da keɓewar wurare masu zafi irin su Mount Kilimanjaro a Afirka, suna nuna wasu daga cikin asara mafi girma daidai gwargwado. Kankara ma'auni shine maɓallin ƙayyade lafiyar kankara. Idan adadin daskararren ruwan sama a cikin yankin tarawa ya wuce adadin kankara mai ƙarancin haske da aka ɓace saboda narkewa ko kuma a cikin yanki ɓarna wani kankara zai ci gaba; idan tarin bai kai yadda ake zubar dashi ba, kankara din zai koma. Kankara a ja da baya zasu sami ma'auni mara kyau, kuma idan basu sami daidaito tsakanin tarawa da zubar da ciki ba, ƙarshe zai ɓace.