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An intercity connection is a typical complex system in which the interaction between cities is crucial for developing low\u2010carbon outputs within the urban agglomeration. This paper presents the construction of the CO<jats:sub>2<\/jats:sub> emission network of an urban agglomeration in the Yangtze River middle reaches megalopolis, based on the gravity model. Combined with social network analysis (SNA), a multilevel analysis framework is proposed to deal with the complexity, spatiality, and visualization of the CO<jats:sub>2<\/jats:sub> emission network with reference to the network features, structural equivalence, and the rich\u2010club phenomenon. The following results emerged: firstly, the spatial structure of the CO<jats:sub>2<\/jats:sub> emissions was characterized by low robustness and compactness, indicating disunity among the studied cities. Secondly, there was found to be a strong correlation between regionalism and intercity connections, with geographically close cities playing a similar role in the network. Thirdly, the \u201crich\u2010club\u201d cities, including Wuhan, Changsha, Xiaogan, and Zhuzhou, dominated the connections, covering more than 87.1% of the network in the Yangtze River Middle Reaches Megalopolis.<\/jats:p>","DOI":"10.1155\/2021\/6612363","type":"journal-article","created":{"date-parts":[[2021,1,7]],"date-time":"2021-01-07T22:36:54Z","timestamp":1610059014000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The Complexity of Urban CO<sub>2<\/sub> Emission Network: An Exploration of the Yangtze River Middle Reaches Megalopolis, China"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8892-5870","authenticated-orcid":false,"given":"Zuo","family":"Zhang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1768-4122","authenticated-orcid":false,"given":"Zhe","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7758-9675","authenticated-orcid":false,"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6731-2960","authenticated-orcid":false,"given":"Yanzhong","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhi","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3086-7193","authenticated-orcid":false,"given":"Lin","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,1,7]]},"reference":[{"key":"e_1_2_8_1_2","doi-asserted-by":"publisher","DOI":"10.1038\/sdata.2017.201"},{"key":"e_1_2_8_2_2","doi-asserted-by":"publisher","DOI":"10.1155\/2015\/395094"},{"key":"e_1_2_8_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.landusepol.2018.04.027"},{"key":"e_1_2_8_4_2","doi-asserted-by":"publisher","DOI":"10.3390\/su10010290"},{"key":"e_1_2_8_5_2","doi-asserted-by":"publisher","DOI":"10.15666\/aeer\/1706_1516915190"},{"key":"e_1_2_8_6_2","unstructured":"YongM. 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