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Hybrid engines on Swiss lakes

There 159 ships in Switzerland licensed for transport. But only four are solar-powered and two run on hybrid engines. Why do shipping companies find it so hard to switch from diesel engines to alternative power? (SRF/swissinfo.ch)

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SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR