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Most hydrogen is produced from fossil fuels, resulting in carbon dioxide emissions. [168] Hydrogen produced by this technology has been described as grey hydrogen when emissions are released to the atmosphere, and blue hydrogen when emissions are captured through carbon capture and storage (CCS).
Hydrogen has the most potential to reduce greenhouse gas emissions when used in chemical production, refineries, international shipping, and steelmaking [1]. The hydrogen economy is an umbrella term for the roles hydrogen can play alongside low-carbon electricity to reduce emissions of greenhouse gases.
Innovation in hydrogen electrolyzers could make large-scale production of hydrogen from electricity more cost-competitive. [139] There is potential for hydrogen produced this way to play a significant role in decarbonizing energy systems where there are challenges and limitations to replacing fossil fuels with direct use of electricity. [129]
Today, most hydrogen is generated by heating coal and natural gas with steam, which produces a good amount of carbon dioxide and nullifies hydrogen's positive impact.
Most hydrogen produced today requires methane, which is a fossil fuel and a strong greenhouse gas contributor. The industry is working on production alternatives, including carbon capture and ...
The worldwide ammonia production, using hydrogen derived from steam reforming, was 144 million tonnes in 2018. [14] The energy consumption has been reduced from 100 GJ/tonne of ammonia in 1920 to 27 GJ by 2019. [15] Globally, almost 50% of hydrogen is produced via steam reforming. [9]
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