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Historical trend of the global usage of H2 predominantly produced by utilizing a fossil fuel feedstock divided into industrial sectors. “Other pure” stands for applications needing high-purity H2, “DRI” stands for direct reduced iron steel production, and “Other mixed” stands for applications using H2 as a mixture gas, e.g., fuel or feedstock synthesis gas. Made from ref (1). Copyright 2019 U.S. Department of Energy.
