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Sustainable energy sources are renewable, like solar, wind, water, hydro, tidal and wave, geothermal, ocean thermal, biomass, biofuel and even hydrogen. They are environmentally friendly because, once installed, they emit no polluting carbon dioxide, which is causing global warming and climate change.

At at present most of the world's electricity comes from burning fossil fuels (coal, oil and natural gas). This has to change.

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Q: How are sustainable energy sources environmentally friendly?
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