Green development of China's Pan-Pearl River Delta mega-urban agglomeration.

In the GSEC, the scale and efficiency of the Changsha-Zhutan, the city groups on the west coast of the Taiwan Strait, and the Beibu Gulf city groups show an increasing trend, indicating existing factors of the allocation structure has formed a certain scale effect within the three urban agglomerations, but the pure technical efficiency of the urban agglomerations on the west coast of the Straits and the urban agglomerations outside the northern part of the Straits is showing a downward trend.

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