U.S. Secretary of Energy Jennifer Granholm said Friday that Washington could export hydrogen to Japan as part of larger bilateral energy cooperation, including wind and nuclear power, as she feels "a sense of urgency" to speed up efforts to curb global warming.

Aboard the Japan-developed liquefied hydrogen carrier — the world's first — at a port near Sapporo, where the Group of Seven ministerial meeting on energy and climate kicks off from Saturday, Granholm said "it is important" to learn from Japan's delivery technology as the next-generation energy source is a "solution" toward global decarbonization.

The United States is expected to select nationwide hydrogen hubs by this fall, and exporting it to Japan is "possible," and among the proposals being evaluated, the secretary said during an interview ahead of the G7 meeting.