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Clean energy, conceptual illustration
Conceptual illustration depicting clean energy. The image shows the chemical symbol for hydrogen (H2) in the clouds. When hydrogen is used as a fuel, whether in fuel cells or combustion engines, it primarily emits water vapour. This makes it a much cleaner fuel option when compared to fossil fuels such as coal, oil, and natural gas. These fuels emit carbon dioxide and other pollutants when burned., by VICTOR de SCHWANBERG/SCIENCE PHOTO LIBRARY
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