2021 a cikin canjin yanayi

Wannan labarin ya rubuta abubuwan da suka faru, binciken bincike, ci gaban kimiyya da fasaha, da ayyukan ɗan adam don auna, hangowa, ragewa, da daidaitawa da tasirin dumamar duniya da canjin yanayi - a cikin shekara ta 2021.

## Bayani

* 26 ga Fabrairu: Rahoton Tarayyar Majalisar Dinkin Duniya kan Gudummawar da aka ƙayyade a ƙarƙashin Yarjejeniyar Paris ya bayyana cewa "ƙididdigar raguwar da aka ambata a cikin sakin layi (a kan hayakin iskar gas) ya kasa abin da ake buƙata, yana nuna buƙatar bangarorin su kara ƙarfafa alkawuransu na ragewa a ƙarƙashin Yaruwar Paris".
* 21 Yuni: Ƙungiyar Meteorological ta Duniya ta rubuta cewa "2021 shekara ce mai yin ko hutu don aikin yanayi, tare da taga don hana mummunar tasirin canjin yanayi - wanda ya haɗa da fari mai tsanani, ambaliyar ruwa da guguwa - rufewa da sauri. "
* 28 ga Yuli: wani ci gaba da gargadi na Masana kimiyya na Duniya na 2019 game da gaggawa na Yanayi  ya lura da "hawan da ba a taɓa gani ba a cikin bala'o'in da suka shafi yanayi tun 2019" kuma ya bayyana cewa akwai "shaida mai yawa cewa muna kusa ko kuma sun riga sun ƙetare wuraren da ke da alaƙa da sassa masu mahimmanci na tsarin Duniya". 
* 6 ga Satumba: editoci daga mujallu na kiwon lafiya sama da 200 sun buga wani edita na hadin gwiwa wanda ya bayyana cewa "Kimiyyar ba ta da tabbas; karuwar duniya ta 1.5 ° C sama da matsakaicin masana'antu da ci gaba da asarar haɗarin halittu masu yawa ga kiwon lafiya wanda ba zai yiwu a juyawa ba.... Babban barazanar lafiyar jama'a ta duniya ita ce ci gaba da gazawar shugabannin duniya don ci gaba da hauhawar zafin duniya ƙasa da 1.5 ° C da kuma dawo da yanayi.&nbsp;&nbsp;
* 30 ga Satumba: Sakatare Janar na Majalisar Dinkin Duniya António Guterres ya bayyana cewa "lokaci yana karewa. Abubuwan da ba za a iya juyawa ba sun kasance kusa da tsoro. " Ya yi kira ga ƙarin burin yayin da NDCs na yanzu za su haifar da hauhawar 2.7 ° C, yana cewa "duk shugabannin dole ne mu gane cewa muna cikin tsakiyar gaggawa na yanayi".&nbsp;

## Ma'auni da kididdiga

* 25 Janairu: wani bita labarin da aka buga a cikin The Cryosphere ya ba da rahoton cewa Duniya ta rasa tan tiriliyan 28 na kankara tsakanin 1994 da 2017, kashi 68% daga narkewar yanayi da kashi 32% ta hanyar narkewar teku. Adadin asarar kankara ya karu da kashi 57% tun daga shekarun 1990 - daga 0.8 zuwa 1.2 tiriliyan ton a kowace shekara mai girma a Matsayin teku na duniya 34.6 ±3.1 mm a wannan lokacin.&nbsp;
* 9 ga Fabrairu: wani binciken da aka buga a cikin *Binciken muhalli* ya kammala cewa kwayoyin halitta masu kyau (PM2.5) wanda ya haifar da ƙone burbushin halittu yana haifar da mutuwar mutane miliyan 8.7 a kowace shekara, gami da China (2.4 miliyan), Indiya (2.5 miliyan) da sassa na gabashin Amurka, Turai da kudu maso gabashin Asiya.
* 16 Fabrairu: sakamakon binciken da aka buga a cikin *PNAS* (lokacin binciken: 1990-2018) ya ba da rahoton ci gaba da tsawo na lokutan pollen (har zuwa kwanaki 20) da karuwa a cikin maida hankali ga pollen (rufe 21%) a duk faɗin Arewacin Amurka, tare da tilasta wa mutum tsarin yanayi yana ba da gudummawa game da 50% na yanayin a cikin lokutan p Pollen da kusan 8% na yanayin a maida hankali.
* Yankin Atlantic meridional overturning circulation (AMOC):

::* 25 Fabrairu: wani labarin Geoscience na Yanayi ya ba da rahoton raguwar "ba a taɓa gani ba" (tun AD 400) a cikin karni na ashirin na yaduwar juyawa ta Atlantic (AMOC), wanda yanzu yana cikin mafi rauni a cikin fiye da shekaru 1,000. AMOC ta sake rarraba zafi a duniya kuma tana da babban tasiri ga yanayi. Musamman, rauni a cikin AMOC, wanda ya haɗa da Florida Current da Gulf Stream, yana hana tasirinsa na matsakaici akan yanayi a Turai.
::* 5 ga watan Agusta: wani binciken da aka buga a cikin Nature Climate Change ya gabatar da "shaidar da ta dace da sararin samaniya cewa, a cikin karni na karshe, AMOC na iya samo asali ne daga yanayin da ya dace zuwa wani batu kusa da canji mai mahimmanci".

* Fabrairu: ma'auni daga Mauna Loa Observatory ya nuna cewa, a karo na farko, matakan CO2 na yanayi sun kai kashi 417 a kowace miliyan (ppm), maida hankali 50% sama da matakin 278ppm kafin masana'antu.
* Maris: Global Energy Monitor ya buga wani bincike kan hayakin methane na ma'adinai wanda ya gano cewa daruruwan sabbin ma'adanai na ma'aikatar da aka tsara na iya fitar da tan miliyan 13.5 na methane a kowace shekara.
* 8 Maris: *Dangi* binciken da aka buga a cikin Nature Climate Change - nazarin tasirin haɗuwa na matsakaicin hauhawar matakin teku na duniya da raguwar halitta da mutum ya haifar - an kiyasta cewa raguwar wuraren bakin teku na iya fuskantar sau hudu fiye da hauhawar matakan teku na duniya fiye da yadda za'a iya danganta shi ga hauhawar yanayin teku na duniya kadai.
* 17 Maris: wani binciken da Tarayyar Red Cross da Red Crescent Societies ta yi ya kiyasta cewa, a duniya tsakanin Satumba 2020 da Fabrairu 2021, mutane miliyan 12.5 sun yi hijira saboda mummunan tasirin canjin yanayi, matsakaicin shekara-shekara ya wuce miliyan 20. 
* 17 Maris: wani binciken da aka buga a cikin Nature ya kiyasta cewa rikice-rikice na carbon da aka adana a cikin gadajen teku na iya sake ma'adinai na carbon a cikin CO="true" id="mwsg" typeof="mw:Transclusion">CO ya kai daidai da 15-20% na CO2 na yanayi da teku ta sha a kowace shekara, kuma ya dace da na aikin gona na ƙasa.
* 18 Maris: wani binciken da aka karɓa don bugawa a cikin *[[Wasiƙun Binciken Muhalli]]* ya kiyasta cewa tsananin tasirin zafi da fari akan samar da amfanin gona a Turai kusan ya ninka sau uku a cikin shekaru 50 da suka gabata, daga -2.2 (1964-1990) zuwa -7.3% (1991-2015). 
* 1 ga Afrilu: wani binciken da aka buga a cikin Nature Climate Change ya kiyasta cewa canjin yanayi na ɗan adam ya rage yawan aikin gona na duniya da kusan 21% tun 1961, da kuma 26-34% a yankuna masu zafi kamar Afirka, Latin Amurka da Caribbean.
* 7 ga Afrilu: NOAA ta ruwaito matakan carbon dioxide sun fi a kowane lokaci a cikin shekaru miliyan 3.6 da suka gabata, a cikin Mid-Pliocene Warm Period lokacin da matakin teku ya kasance kusan 24 mm (78 ft) sama da yau kuma matsakaicin zafin jiki ya kasance kusan 4 ° C (7 ° F) sama da a lokutan kafin masana'antu.&nbsp;&nbsp;&nbsp;&nbsp;
* *Ma'anar [[Gudanar da Tsarin Ruwa da Ruwa na ƙasa|NOAA]] na "ma'auni" da "al'ada":*

## Manazarta