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In this Feb. 2, 2019, photo, North Koreans men walk with the background of the West Sea Barrage in Nampo, North Korea. North Korea is exploring two ambitious alternative energy sources, tidal power and the production of coal-based synthetic fuels, that could greatly improve its standard of living while reducing its reliance on oil imports and vulnerability to sanctions. (AP Photo/Dita Alangkara)

In this Feb. 2, 2019, photo, North Koreans men walk with the background of the West Sea Barrage in Nampo, North Korea. North Korea is exploring two ambitious alternative energy sources, tidal power and the production of coal-based synthetic fuels, that could greatly improve its standard of living while reducing its reliance on oil imports and vulnerability to sanctions. (AP Photo/Dita Alangkara)

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