Duniya sanyaya
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Zubar da hankali a duniya wani zato ne, musamman a cikin shekarun 1970s, na sanyaya mai zuwa na Duniya wanda ya ƙare a cikin wani lokaci mai zurfi, saboda tasirin sanyaya na aerosols ko tilastawar orbital. Wasu rahotanni na manema labarai a cikin shekarun 1970 sun yi hasashe game da ci gaba da sanyaya; waɗannan ba su nuna ainihin wallafe-wallafen kimiyya na lokacin ba, wanda gabaɗaya ya fi damuwa da dumama daga ingantaccen tasirin greenhouse.[1]
A tsakiyar shekarun 1970s, iyakantaccen jerin zafin jiki da ake samu ya nuna cewa zafin jiki ya ragu na shekaru da yawa har zuwa lokacin. Yayin da jerin lokaci masu tsawo na inganci mafi girma suka kasance, ya zama bayyananne cewa zafin jiki na duniya ya nuna karuwa mai yawa gaba ɗaya.