This plane can fly 500 miles, powered entirely by hydrogen

ZeroAvia, the startup that designed the hydrogen-fueled electric powertrain inside the plane, has been testing the technology over the past year and emerged from stealth today. The company says it will run a full test flight with hydrogen on board in a few weeks. In 2022, it plans to begin supplying the powertrain for use in planes with as many as 20 seats, on flights up to 500 miles long.

Several other startups are also working on technology designed to cut emissions from air travel, an industry responsible for nearly 900 million metric tons of CO2 emissions a year at a time when emissions need to begin to shrink to zero. But most other companies rely on batteries to store electric power.