Light, partly human-powered hybrid vehicles offer a valid urban mobility alternative
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Living sustainably and enjoying it, with the Climate Savings Book, can be a lot of fun!
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In the preservation and use of historical documents, their cleaning is necessary at some point.
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The German Youth Hostel Association
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The energy efficiency of buildings is often measured by their heating requirements.
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Energy-efficient renovation
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Aquatic organisms such as barnacles
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Lowest possible frictional resistance or »viscous drag«
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Clean, pure drinking water is crucially important to human health.
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Underwater growth on ships
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