Black or brown hydrogen is extracted from coal. Gray hydrogen is made by heating natural gas. Both create carbon dioxide. Blue hydrogen captures about 90% of that carbon dioxide and stores it, usually underground. Green hydrogen uses renewable energy to split hydrogen out of water using electricity. Pink hydrogen does the same but relies on nuclear power.

The federal government plans to build several hydrogen hubs around the country. The goal is to find a cleaner replacement for fossil fuels. But there are challenges in how hydrogen is produced.

(Image credit: Meredith Miotke for NPR)


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