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Non-renewable energy sources are the ones which we can only use once and of which there are relatively limited amounts available.

Typically, these are oil, natural gas and coal.

They were formed inside the earth over millions of years from dead organisms. Such fossil fuels (petroleum, methane, and coal) are non-renewable resources. If exhausted, they would take millions of years to be renewed.

Renewable resources on the other hand primarily use natural phenomena such as wind, sun, tides, and geothermal heat (replenished by nature), or biological resources that can be replaced over a short period.

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