In August, the White House passed a historic piece of legislation with $369 billion in spending to address climate change. One of the most significant tax credits in that historic law was a tax credit to make hydrogen in climate-conscious ways.

Hydrogen is currently used for many purposes, including making ammonia-based fertilizer, which the world depends on for growing crops, and for refining crude oil into useful petroleum products. But it’s also likened to a “Swiss Army Knife of decarbonization,” because it could be used as a power source in industries that are particularly hard to wean off fossil fuels, like airplanes and heavy shipping.