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Some 3% of global greenhouse gas emissions can be attributed to international maritime transport. Turkish company Navtek Naval Technologies is trying to cut that with its ZEEtug, the world’s first all-electric, zero-emission, rechargeable harbor tugboat. Currently operated by Turkey’s Gisas Shipbuilding, Navtek’s boats can run for up to three hours on a single charge. Besides saving on fuel costs, the vehicle’s electric motor reduces heat emissions and cuts down on the noise pollution that disturbs marine life.

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