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In page Blast furnace:
"Fossil fuel (coke, natural gas) use in blast furnaces is a source of greenhouse gas emissions and the blast furnace is the most emission intensive stage of the steel making process.[1][2] Fuels and reductants such as plastic waste,[3] biomass[4] and hydrogen[5] are being used by steelmakers[6] as possible alternatives to fossil fuels, although cost and availability remain a challenge[citation needed] and deployment is limited.
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