Ngokokuqala ngqá kusukela maphakathi nekhulu lama-20, ngaphezu kwamaphesenti angu-95 omthamo omusha wokuphehla ugesi kulo nyaka e-United States awuziro-carbon.[1] Igesi yemvelo kade kuthenjelwe kuyo ukuthi iqinisekise ukuthi amagridi kagesi esizwe aletha ugesi lapho kudingeka. Kodwa-ke, izitayela zakamuva zibonisa ...