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Quelle : jacoblund/iStock/Thinkstock
![](lw_resource/lw_events/lw_news_logo_102.jpg)
Quelle: Thinkstock/gettyimages international:
Windräder: javigarlu; Abwasser: daizuoxin; Pumpen: sauletas; Pipelines: Andrei Merkulov; Flaschen: Ryan McVay; Holz: yellowpau
![](lw_resource/lw_events/lw_news_logo_98.jpg)
Quelle : Thinkstock/gettyimages international:
Windräder: javigarlu; Abwasser: daizuoxin; Pumpen: sauletas; Pipelines: Andrei Merkulov; Flaschen: Ryan McVay; Holz: yellowpaul;
![](lw_resource/lw_events/lw_news_logo_97.jpg)
Quelle: BONNINSTUDIO/iStock/Thinkstock
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Quelle: WavebreakmediaMicro/fotolia.com
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Quelle: robertsrob/iStock/Thinkstock
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Quelle: thinkstock/iStock/welcomia
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Quelle: thinkstock/iStock/alphaspirit