| Ranking | Keywords | (in)Degree centrality | Keywords | Node betweenness centrality | |
|---|---|---|---|---|---|
| 1 | Environmental pollution | 0.242424 | Urban | 0.241362 | Degree centrality concentric |
| 2 | Environmental | 0.212121 | Environmental | 0.185192 | |
| 3 | Urban | 0.19697 | Environmental pollution | 0.14102 | |
| 4 | Disposal | 0.166667 | Regeneration | 0.098105 | |
| 5 | Regeneration | 0.151515 | Disposal | 0.087156 | |
| 6 | Garbages | 0.121212 | Development | 0.073519 | |
| 7 | Development | 0.121212 | Metropolitan area | 0.066866 | |
| 8 | Resources | 0.106061 | Garbages | 0.05854 | |
| 9 | Local | 0.090909 | Local | 0.044306 | |
| 10 | Life | 0.090909 | Installation | 0.03893 | |
| 11 | Plan | 0.090909 | Industry | 0.038225 | |
| 12 | Facility | 0.075758 | Life | 0.03394 | |
| 13 | Use | 0.060606 | Plan | 0.033911 | |
| 14 | Metropolitan area | 0.060606 | Facility | 0.028726 | |
| 15 | nstallation | 0.060606 | Resources | 0.024191 | |
| 16 | Industry | 0.060606 | Culture | 0.02331 | Node betweenness centrality concentric |
| 17 | Problem | 0.060606 | Environmental Office | 0.022832 | |
| 18 | Land fill | 0.060606 | Possibility | 0.020027 | |
| 19 | Construct | 0.060606 | Business | 0.016941 | |
| 20 | Possibility | 0.060606 | Incineration | 0.013649 | |
| 21 | Damage | 0.045455 | Foreign country | 0.013583 | |
| 22 | Utilization | 0.045455 | Government | 0.012121 | |
| 23 | Waste | 0.045455 | Alternative energy | 0.01155 | |
| 24 | Periphery | 0.045455 | Rural | 0.009518 | |
| 25 | Research | 0.045455 | Measure | 0.007502 | |
| 26 | Incineration | 0.045455 | Construct | 0.006784 | |
| 27 | Society | 0.045455 | Research | 0.005296 | |
| 28 | Alternative energy | 0.045455 | Green space | 0.00311 | |
| 29 | Environmental Office | 0.030303 | Maintenance | 0.002915 | |
| 30 | Foreign country | 0.030303 | City traffic | 0.0027 | |
| Centralization index | 19.858% | 22.419% | |||