Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Mwero wokupfuura kwemaminerari esilicate uchawedzera sezvo tembiricha dzinokwira dzichimhanyisa kuita kwemakemikari. Ikokuwo kuchaderedza mwero wecarbon dioxide mumhepo yakapoteredza pasi, sezvo iyi miitiro yokushanduka kwemamiriro okunze ichishandura gasi recarbon dioxide kuva carbonates yakasimba. Mukati memakore 600 mamiriyoni anotevera kubva zvino, mwero wekabhoni dayokisi uchadonha pasi pechikamu chinokosha chinodiwa kuti C3 ishandiswe pakuita photosynthesis: anenge zvikamu 50 pamiriyoni imwe. Panguva ino, miti nemasango zvazviri iye zvino hazvichazokwanisi kurarama, miti yokupedzisira ichiripo inenge iri yemakoniferi anogara akasvibira. Zvisinei, C4 carbon fixation inogona kupfuurira pamwero wakaderera zvikuru, pasi kusvika kumativi anopfuura 10 pamiriyoni. Nokudaro miti inoshandisa C4 photosynthesis ingakwanisa kupukunyuka kweanenge makore mabhiriyoni 0,8 uye zvichida kwenguva yakareba semakore mabhiriyoni 1,2 kubva zvino, pashure pokunge tembiricha dzinokwira dzichaita kuti zvisikwa zvipenyu zvisagadzirisike. Pari zvino, zvinomera zveC4 zvinomiririra inenge 5% yezvicherwa zvepasi pano uye 1% yemarudzi azvo anozivikanwa emiti. Somuenzaniso, inenge 50% yemarudzi ose ehuswa (Poaceae) inoshandisa nzira yeC4 photosynthetic, sezvinongoitawo marudzi akawanda emhuri yemakwenzi Amaranthaceae. Kana mwero wekabhoni dhayokisaidhi uchidonha kusvika pamuganhu apo photosynthesis inenge isingachagadzirisiki, chikamu chekabhoni dhayokisaidhi mumhepo inotarisirwa kutenderera kumusoro uye pasi. Ikoku kuchabvumira miti yomunyika kukura nguva imwe neimwe mwero wekabhoni dayokisi paunokwira nemhaka yebasa ramatektoni nokufema kunobva muupenyu hwemhuka. Zvisinei, muitiro wenguva refu ndewokuti upenyu hwezvirimwa panyika hunofa chose chose sezvo kabhoni yakawanda inosara mumhepo inoita kuti ipinde muNyika. Mamwe makemikari anokwanisa kuita photosynthesis pahuwandu hwecarbon dioxide yezvikamu zvishomanana pamiriyoni, saka zvipenyu izvi zvingangofa chete nemhaka yekukwira kwetembiricha uye kurasikirwa kwebiosphere. Zvirimwa - uye, nokuwedzera, mhuka - zvinogona kurarama kwenguva yakareba nokushandura dzimwe nzira dzakadai sekuda carbon dioxide shoma nokuda kwemaitiro e photosynthetic, kuva...  Mubvunzo: Gasi ripi raizoparira kufema kana risina kudzorerwa nezvirimwa?
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