As shown by the results, firstly, the ULGUE in the YRB over the 2004–2017 periods showed a trend of first decreasing and then increasing.
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Spatio-Temporal Urban Land Green Use Efficiency under Carbon Emission Constraints in the Yellow River Basin, China.
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The sentences
Thus, ULGUE showed a decreasing trend in the period, which is consistent with the findings of Xue et al.