The promise of hydrogen fuel is that it could cut emissions in industries that have proven difficult to decarbonize. It’s a lot of pressure for an industry that’s barely off the ground.

It’s part of the White House’s plan to accelerate the domestic market for low-cost, clean hydrogen.

If you use renewable energy to make hydrogen and use the hydrogen to manufacture steel, the process would be friendlier to the environment.

British prime minister Boris Johnson pledges to turn the U.K. into a leading producer of carbon-free hydrogen to cash in on a global boom.

Airbus hopes to fly the first zero-emission, hydrogen-powered commercial aircraft by 2035. Other low-carbon fuels may be closer to widespread adoption.