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Quelle: Forschungszentrum Jülich GmbH
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Quelle : Thinkstock/gettyimages international:
Windräder: javigarlu; Abwasser: daizuoxin; Pumpen: sauletas; Pipelines: Andrei Merkulov; Flaschen: Ryan McVay; Holz: yellowpaul;
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Quelle: WavebreakmediaMicro/fotolia.com
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Quelle: Forschungszentrum Jülich GmbH
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Quelle: thinkstock/iStock/welcomia
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Quelle: thinkstock/iStock/alphaspirit
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Quelle: Forschungszentrum Jülich GmbH