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FILE- In this Tuesday, July 4, 2017 file photo, the Energy Observer, a former race boat turned into a autonomous navigation with hydrogen, sails past the Eiffel Tower on the Seine river in Paris. A boat that fuels itself is setting off from Paris on a six-year, round-the-world journey that its designers hope serves as a model for emissions-free energy networks of the future. (AP Photo/Kamil Zihnioglu, File)

FILE- In this Tuesday, July 4, 2017 file photo, the Energy Observer, a former race boat turned into a autonomous navigation with hydrogen, sails past the Eiffel Tower on the Seine river in Paris. A boat that fuels itself is setting off from Paris on a six-year, round-the-world journey that its designers hope serves as a model for emissions-free energy networks of the future. (AP Photo/Kamil Zihnioglu, File)

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