Yayinda karatu ya yawaita wanda ɗumamar yanayi zai haifar fari mafi tsanani, tsayi kuma mafi yawa, yanzu akwai wani binciken wanda bai dace da wannan ka'idar ba. Wannan shi ne wanda Jami'ar California a Irvine da Jami'ar Washington suka gudanar, kuma an buga shi a cikin mujallar kimiyya Proceedings of the National Academy of Sciences (PNAS).
A cewar marubutan, yawan adadin carbon dioxide yana ba shuke-shuke damar rike karin ruwa a cikin kasa, don haka za su fi dacewa da yanayin zafi.
Har zuwa yanzu, ƙimar yanayi (zafin jiki, zafi, hazo) ne kawai aka yi la'akari don tantance fari, kamar yadda yake da Fihirisar Tsananin Raunin Palmer. Tare da wannan bayanin, an kiyasta cewa fiye da 70% zasu fuskanci fari idan a cikin shekaru ɗari ana fitar da hayaƙi CO2 da huɗu na zamanin kafin masana'antu. Koyaya, idan aka haɗa bayani game da amfani da ruwa ta tsirrai, wannan ƙimar ta faɗi 37%, me yasa?
Carbon dioxide yana da mahimmanci ga shuke-shuke. Ba tare da shi ba, ba za su iya yin hotuna ba kuma ba za su iya girma ba. Don su sha shi, suna buɗe gine-ginen da suke da shi a cikin ganyayyaki da ake kira stomata, amma wannan matsala ce, saboda tana barin danshi ya fita. Kodayake yanayin ya canza idan akwai mai yawa CO2 da ke cikin yanayi tun stomata baya buƙatar buɗe wannan tsawon, kuma sakamakon haka, asarar ruwa ta ragu.
Duk da haka, idan fari ya faru a lokacin dumi, suna mutuwa. Shuke-shuke sun zama marasa ƙarfi, kuma a yin haka kwari ke kashe su cikin 'yan kwanaki ƙalilan. Don haka, koda kuwa akwai karancin fari, zasu iya haifar da mummunan sakamako.
Kuna iya karanta cikakken nazarin a nan (cikin Turanci).