Carbon intensity shows an overall downward trend in three main stages: the first one is from 2000 to 2002, a decreasing trend; the second one is from 2002 to 2004, a rising trend; and the third stage, an again decreasing trend.
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The sentences
Spatial lag model (SLM) was utilized by Huang and Meng (2013) to investigate CO 2 emissions convergence and they found that the convergence rate showed an increasing trend when considering spatial effects.