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. 2019 May 2;7:e6869. doi: 10.7717/peerj.6869

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©2019 Chen et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) The total emergy of Dongying from 2000 to 2016 (B) The total emergy of Binzhou from 2000 to 2016. R, local renewable resources. N₀, rough non-renewable resources. N₁, local centralized used resources. IMP, import resources. U, total emergy used.