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Container ships and other maritime vessels currently run on pollutant-intensive heavy fuel oil. The world's largest container-shipping company, Maersk, has promised to make its operations zero carbon by 2050. Doing so will require using new fuels such as hydrogen. John Greim/LightRocket via Getty Images hide caption

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John Greim/LightRocket via Getty Images

The Dawn Of Low-Carbon Shipping

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Right now, there are an estimated 300,000 refrigerated trucks cooled by diesel engines on the road in the U.S. Researchers are hoping to replace them with a fuel-cell-based cooling system — which means your foods would hitch a greener ride to the store. Flickr Creative Commons/Scania Group hide caption

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Flickr Creative Commons/Scania Group