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.
Toyota and other automakers plan to sell "tens of thousands" of hydrogen-powered vehicles by the end of this decade. But it might be a while before hydrogen cars hit U.S. roads.