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| Abfallverwertung (2) |
| Belgien (2) |
| Belgium (2) |
| Bundesrepublik Deutschland (2) |
| climate policy (2) |
| climate protection (2) |
| cross-border cooperation (2) |
| Energieerzeugung (2) |
| Energiepolitik (2) |
| energy policy (2) |