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<p>influence the degree to which it will be used in chemical feedstocks, long haul aviation and shipping, and long-term energy storage. Production costs of low- and zero-carbon hydrogen are evolving. Future costs may be influenced by <a href="page.php?w=carbon_taxes">carbon taxes</a>, the geography and geopolitics of energy, energy prices, technology choices, and their raw material requirements. The U.S. Department of Energy's Hydrogen Hotshot Initiative seeks to reduce the cost of green hydrogen drop to $1 a kilogram by 2031, though the cost of</p><p>
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