How S. Korea is transitioning into a hydrogen economy with 'hydrogen c… ArirangNews 0 18 11.07 20:40 https://www.youtube.com/watch?v=d5eoelCtv7c + 2 https://www.youtube.com/feeds/videos.xml?channel_id=UCzznO4xSV8BKnUBPy… + 2 How S. Korea is transitioning into a hydrogen economy with 'hydrogen cities'