Overall, there is an increasing trend of CO 2 from 2000 and onward, except in 2008 where the global crises existed, when both imports and exports tended to decrease, the low level of trade activities contributing less CO 2 emissions.
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Linkages between Trade, CO<sub>2</sub> Emissions and Healthcare Spending in China.
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The sentences
The impact of factor industrial production on CO 2 is positive and highly significant.