The hydrogen is then used as an emissions-free fuel to run an alkaline fuel cell whilst the carbon dioxide is captured.
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These efforts include chemically washing minerals and impurities from the coal, gasification (see also IGCC), treating the flue gases with steam to remove sulfur dioxide, carbon capture and storage technologies to capture the carbon dioxide from the flue gas and coal de-watering technologies to improve the energy quality and thus the efficiency of burning coal for energy.
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According to Fred Pearce's Greenwash column in The Guardian, "clean coal" is the "ultimate climate change oxymoron"—"pure and utter greenwash" he says.