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Energy fuelled in ways that do not use up the earth's natural resources or otherwise harm the environment, especially by avoiding the use of fossil fuels or nuclear power.
- ‘Any serious attempt to shift from fossil fuels to alternative energy demands greater national and global efforts.’
- ‘We should pursue all viable alternative energy sources, from nuclear power to solar to geothermal.’
- ‘While we're on the subject of costs, consider that the cheapest and safest form of alternative energy is - using less.’
- ‘This technology is no cure all, but it would at least give the world a chance and the requisite breathing space to further develop alternative energy sources.’
- ‘Naturally, for alternative energy to be useful, it must be boundless, renewable, and not take away anything from the environment.’