An article discussing climate change mentions 'renewable energy sources' such as solar and wind power.
What is the key characteristic of 'renewable' energy sources?
They are naturally replenished and will not run out as a result of being used.
They are finite and will eventually run out, like oil and coal.
They are the most expensive forms of energy available.
They can only be used in very specific, remote locations.
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The prefix 're-' means 'again', and 'new' means 'new'. 'Renewable' means something that can be made new again. In the context of energy, it refers to sources that are not depleted by use, such as sunlight (solar) and wind, as opposed to fossil fuels, which are non-renewable.
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