Definition of "gigatonnes" [gigatonnes]

• Plural form of gigatonne. (noun)

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• "Combined, the two ice sheets dumped 475 gigatonnes of ice which then melted into the ocean each year."
• "Averaged over the 18 years of the study, the ice sheets lost a combined 36 gigatonnes more each year than they had the year before."
• "To have a likely chance of staying below 2 degrees of warming, the world will need to be producing emissions of no more than 44 gigatonnes GT CO2e by 2020."