A worker refuels a hydrogen-powered heavy-duty truck at a hydrogen station in the Tangshan Haigang Economic Development Zone of Tangshan, north China's Hebei Province, April 14, 2021. Five hydrogen-powered heavy-duty trucks have been introduced on Wednesday by the Tangshan Haigang Economic Development Zone. The fleet of trucks are among the zone's first attempts to optimize its industrial structure and energy consumption by gradually replacing diesel fuel with the more eco-friendly hydrogen power cells. (Xinhua/Yang Shiyao)
