A non-renewable source of energy is:

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Petroleum. Renewable energy sources also called as non-conventional energy are sources that are continuously replenished by natural processes. For example, solar energy, wind energy, bio-energy (bio- fuels grown sustainably), hydroenergy, geothermal energy, wave and tidal energy are ecofriently and examples of renewable energy sources. Renewable energy comes directly from sun and wind and can never be exhausted, therefore they are called renewable. A renewable energy system converts the energy found in sunlight, wind, falling-water, sea waves, geothermal heat or biomass into a form, which can be used such as heat or electricity. Most important aspect of renewable energy or non-conventional energy sources is that they are pollution free energy sources. However, most of the world's energy sources are derived from conventional sources-fossil fuels such as coal, oil, and natural gases. These fuels are often termed as non- renewable energy sources. Although, the available quantity of these fuels are extremely large, they are nevertheless finite and so will in principle run out at some time in the future. Renewable energy sources are essentially flows of energy, whereas the fossil and nuclear fuels are in essence, stocks of energy.

A non-renewable source of energy is:

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