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alternative energy

noun
🔊/ɔːlˌtɜːnətɪv ˈenədʒi/
🔊/ɔːlˌtɜːrnətɪv ˈenərdʒi/
[uncountable]
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  1. electricity or power that is produced from the sun, wind, water, etc. in ways that do not use up the earth's natural resources or harm the environment