Temporal variation in city-level CO 2 emissions and emissions intensity The interannual variations in carbon emissions from existing inventories all showed an increasing trend during 2000–2012, ranging from 355 ± 58 Mt to 915 ± 178 Mt CO 2 , and then tended to level off or showed a slight downward trend afterwards (Fig. 4 ).
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A city-level comparison of fossil-fuel and industry processes-induced CO<sub>2</sub> emissions over the Beijing-Tianjin-Hebei region from eight emission inventories.
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The emissions intensity (CO 2 emissions per unit of GDP) in the JJJ region showed a decreasing trend since 2000 (Fig. 4 ).