Sunlight can be harnessed by semiconductors to generate a fuel, hydrogen gas, from water. This approach will be impracticable until certain materials-related constraints are overcome: photochemists are on the case.
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Lewis, N. Light work with water. Nature 414, 589–590 (2001). https://doi.org/10.1038/414589a
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DOI: https://doi.org/10.1038/414589a
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